timeline

timeline — noun

1. a line, diagram, or list that shows events in the order they happened, from the

1.nounB1
Definition

a line, diagram, or list that shows events in the order they happened, from the earliest to the most recent — often used in history, biographies, or project plans to make the sequence of events easy to understand at a glance.

Example

The museum displayed a <hw>timeline</hw> of the Ming dynasty with key battles and inventions marked.

collocation: a timeline of [topic]

Salma drew a <hw>timeline</hw> of her life from birth through college for a school project.

subject: person creating a timeline

Common collocations
  • timeline of events
  • historical timeline
  • create a timeline
  • show on a timeline
Synonyms
  • chronology

    more formal, often refers to the sequence itself rather than a visual representation

  • time chart

    less common; emphasises the visual/graphic format

Grammar Patterns

a timeline of [something]

Usage Note

Often followed by of + a topic or period. A timeline can be a drawn line, an infographic, or simply a chronological list. Distinguish from sense 2: sense 1 focuses on past events already completed; sense 2 looks forward to future deadlines.

Common Mistakes

The timeline shows what will happen next month.' (if referring to past events)
The timeline shows what happened during the war.
sense 1 is about events that have already occurred.
I put the meetings on a timeline' (vague)
I put the meetings on a timeline for the quarterly review.
a timeline needs a subject or period to be useful.

2. a plan that lists the expected dates and time needed for each stage of a project

2.nounB1
Definition

a plan that lists the expected dates and time needed for each stage of a project, product launch, or process — so that everyone involved knows when things must be finished.

Example

The construction team agreed on an eighteen-month <hw>timeline</hw> for the new apartment building.

collocation: timeline for [project]

Benjamin asked his manager for a realistic <hw>timeline</hw> before promising the client a delivery date.

Common collocations
  • project timeline
  • aggressive timeline
  • meet the timeline
  • set a timeline
Synonyms
  • schedule

    more general; a timeline is a type of schedule that emphasises sequence and deadlines

  • timetable

    more commonly used for transport or class schedules; timeline is broader for projects

  • deadline

    a single end date, not the whole plan

Grammar Patterns

a timeline for [project/task]

set a timeline

within a timeline

Usage Note

Frequently used with set, agree on, meet, or stick to. The timeline for sense 2 looks forward (future deadlines) whereas sense 1 looks backward (past events). Subject is often a team, company, or project manager.

Common Mistakes

The schedule is a timeline of what already happened.
The schedule is a timeline for what still needs to be done.
sense 2 is about future planning, not past reporting.

3. the connected series of important events, changes, or stages that a person, orga

3.nounB2
Definition

the connected series of important events, changes, or stages that a person, organization, or place has experienced over a period of time — like a biography condensed into major milestones.

Example

The documentary traces the <hw>timeline</hw> of the artist's career from her first gallery show to international fame.

collocation: trace the timeline of [someone]

Joon's book follows a clear <hw>timeline</hw> of his childhood in Seoul and his move to Vancouver.

Common collocations
  • timeline of events in one's life
  • personal timeline
  • career timeline
Synonyms
  • history

    broader; timeline implies a structured sequence of key points

  • story

    less structured; a timeline is more factual and date-driven

Grammar Patterns

the timeline of [someone/something]

Usage Note

Usually singular. Commonly paired with trace, follow, or present. Distinguish from sense 1: sense 3 tells a story about ONE subject's life or development, while sense 1 is a broad ordering of many separate events across a period.

Common Mistakes

The timeline of the war shows dates' (sense 1 territory)
The timeline of the war shows how the country changed from beginning to end.
sense 3 emphasises the subject's transformation over time.

4. one of two or more separate sequences of events that exist within a fictional st

4.nounB2
Definition

one of two or more separate sequences of events that exist within a fictional story, each set at a different time or running alongside one another — common in tales involving time travel, parallel worlds, or flashbacks across different periods.

Example

The sci-fi film follows two separate <hw>timelines</hw> — one set in 1995 and the other in 2085.

pattern: two separate timelines — one in [year], the other in [year]

Players switch between a past <hw>timeline</hw> and a future one to unlock hidden clues in the game.

Common collocations
  • alternate timeline
  • parallel timeline
  • split timeline
  • multiple timelines
Synonyms
  • alternate reality

    broader; a timeline focuses on the sequence of events, not the whole world

  • storyline

    timeline emphasises chronological structure; storyline emphasises plot and character

Grammar Patterns

alternate timeline

parallel timeline

multiple timelines

Usage Note

Often plural because the concept implies at least two coexisting sequences. Frequently appears with alternate, parallel, split, or multiple. Common in reviews and discussions of time-travel or multiverse stories.

5. the area on a social media platform where updates, photos, videos, and posts fro

5.nounA2
Definition

the area on a social media platform where updates, photos, videos, and posts from a user and the people they follow appear in reverse chronological order — newest content at the top.

Example

Christopher found an old photo from his graduation party while scrolling his Facebook <hw>timeline</hw>.

The charity posted the fundraising results on their <hw>timeline</hw> so supporters could see the total raised.

collocation: post on [someone's] timeline

Common collocations
  • on my timeline
  • Facebook timeline
  • scroll through the timeline
  • post on the timeline
Synonyms
  • feed

    more general; timeline is the specific term used by Facebook and some other platforms

  • wall

    older term used by early Facebook; timeline replaced wall in 2011

Grammar Patterns

on someone's timeline

scroll through a timeline

Usage Note

Specific to social media platforms such as Facebook, LinkedIn, and Twitter/X (though Twitter uses 'feed' rather than 'timeline'). A user's timeline shows their own posts plus friends' activity. Distinguish from sense 2: a social media timeline is a livestream of content, not a forward-looking plan.

Common Mistakes

I posted a timeline on the wall.' (confusing senses)
I posted a photo on my timeline.
use 'on' not 'to' for social media timelines.

6. the total amount of time allowed or available for completing a project, task, or

6.nounB2
Definition

the total amount of time allowed or available for completing a project, task, or activity — often stated as a specific period such as three months or two years.

Example

The research team must finish the data collection within a six-month <hw>timeline</hw> set by the funding agency.

pattern: within a [duration] timeline

Reema asked the client to confirm the project <hw>timeline</hw> before the designers began the mock-up phase.

Common collocations
  • tight timeline
  • project timeline
  • within a timeline
  • six-month timeline
Synonyms
  • time frame

    interchangeable; time frame is slightly more formal

  • duration

    refers only to length, not to deadlines or milestones

  • window

    suggests a narrower or more flexible period

Grammar Patterns

within a [number]-[unit] timeline

a timeline of [duration]

Usage Note

Often used in formal or business contexts. Frequently paired with adjectives such as strict, tight, realistic, six-month, or two-year. Distinguish from sense 2: sense 2 is a detailed plan with individual deadlines; sense 6 is simply the total duration boundary.

Common Mistakes

We have a timeline of six months.' (ambiguous)
We have a six-month timeline to complete the pilot study.
specify what the timeline applies to.

Synonym discussion

Sense: noun/1

A timeline shows events in the order they happened, often as a visual line or diagram. A chronology is the arrangement of events in time order but does not have to be visual — it can be a written list or a historical method. A schedule is a forward-looking plan with specific times or dates for completing tasks, whereas a timeline (sense 2) often groups events into broader phases. A timetable is more rigid and usually associated with transport, classes, or fixed routines. A time frame refers only to the total period allowed, without the detailed milestones of a timeline. For example, a historian writes a chronology of the war; a project manager creates a timeline with deadlines; the teacher posts a timetable of weekly classes; and the client gives a six-month time frame.

timeline ↗chronologyschedule ↗timetable ↗time frame

Common collocations

Nouns

  • project timeline
  • event timeline
  • production timeline
  • development timeline
  • social media timeline

Adverbs

  • chronologically
  • sequentially
  • linearly
  • roughly

Phrases

  • set a timeline
  • follow a timeline
  • create a timeline
  • stick to a timeline
  • extend the timeline
  • timeline of events

Prepositions

  • on a timeline
  • within a timeline
  • along a timeline
  • beyond the timeline

Etymology

Old EnglishLatinEnglish

Timeline is a compound of time (from Old English tīma, meaning a limited stretch of duration) and line (from Old English līne, meaning a string or cord, via Latin linea). First recorded in the mid-19th century for literal drawn lines showing historical time. The project-planning sense emerged in the mid-20th century, followed by the social-media sense in the early 2000s with the rise of Facebook.