primary

primary — adjective

1. more important, serious, or significant than anything else in a particular situa

1.adjectiveB2
Definition

more important, serious, or significant than anything else in a particular situation — for example, the primary reason for a decision, the primary goal of a project, or a person's primary responsibility at work.

Example

The primary reason Feng moved to Taipei was the job offer from the university.

primary + noun: primary reason

Safety is the primary concern when engineers design a new bridge.

primary + noun: primary concern

Common collocations
  • primary concern
  • primary reason
  • primary goal
  • primary purpose
  • primary responsibility
  • primary objective
Synonyms
  • main

    the everyday equivalent, wider register than primary

  • principal

    slightly more formal; often used for people (principal dancer) or abstract things (principal cause)

  • chief

    slightly dated; common in official job titles (chief executive)

  • foremost

    more literary or emphatic; suggests leading position among many

Antonyms
  • secondary

    less important than the primary concern or goal

  • subordinate

    lower in rank, often used in formal or organisational contexts

Grammar Patterns

primary + noun

Usage Note

Used almost always before a noun. Unlike most adjectives, 'primary' rarely appears after a linking verb to describe the subject (❌ 'This reason is primary.' ✅ 'This is the primary reason.').

Common Mistakes

The primary results showed we were winning.
The preliminary results showed we were winning.
'primary' means most important; 'preliminary' means happening before the main event.

2. relating to the first stage of formal schooling, covering children from about ag

2.adjectiveB1
Definition

relating to the first stage of formal schooling, covering children from about age five up to around eleven, before they enter secondary school.

Example

Eliska teaches music at a primary school in a village near Hsinchu.

primary + noun: primary school

Primary education in Taiwan covers the first six years of compulsory schooling.

primary + noun: primary education

Common collocations
  • primary school
  • primary education
  • primary teacher
  • primary classroom
  • primary pupil
Synonyms
  • elementary

    more common in American English; covers the same age range

  • early

    broader term; can refer to any early stage, not just education

Antonyms
  • secondary

    relating to schooling for older children, typically ages 11-16 or 11-18

Grammar Patterns

primary + noun

Usage Note

Always used before a noun. In American English the term 'elementary school' is more common than 'primary school', though 'primary education' is used in both varieties. This sense does not apply to secondary or higher education.

Common Mistakes

She works at a primary high school.
She works at a primary school.
'primary' refers to elementary-level education, not high school or secondary school.

3. happening or developing first in a sequence, before other events, stages, or for

3.adjective
Definition

happening or developing first in a sequence, before other events, stages, or forms appear — for example, the primary stage of an illness, the primary layer of rock, or primary research data collected directly from original sources.

Example

The primary stage of the project involves interviewing residents about their daily habits.

primary + noun: primary stage

Archaeologists found evidence of primary settlements along the river dating back thousands of years.

primary + noun: primary settlement

Common collocations
  • primary stage
  • primary phase
  • primary layer
  • primary source
  • primary data
Synonyms
  • first

    the everyday word for the initial item in a series; 'primary' is more formal and structural

  • earliest

    emphasises the point in time rather than the order in a sequence

  • initial

    slightly more formal than 'first'; common in academic and professional writing

Antonyms
  • final

    the last stage or step in a process

  • later

    occurring after the primary stage

Grammar Patterns

primary + noun

Usage Note

Always used before a noun. When describing the first item in a simple sequence, 'first' is more common in everyday speech. 'Primary' carries a slightly more formal or scientific tone and often implies an early stage within a larger process or system.

primary — noun

primary — verb

Word family

Synonym discussion

Sense: adjective/1

All five words describe something of the highest importance or rank, but they differ in register and typical context. 'Main' is the most neutral, everyday word — you can use it in almost any situation, from 'the main reason' to 'the main road'. 'Primary' is more formal and often suggests first in a structural or logical order, not just in importance; it is common in academic, business, and medical writing. 'Principal' is slightly more formal still and frequently appears in job titles ('principal dancer') and abstract contexts ('principal cause of failure'). 'Chief' can sound slightly dated but remains common in official titles ('chief executive', 'chief medical officer'). 'Foremost' is the most literary and emphatic of the group, often used to describe a leading expert or authority ('the world's foremost physicist'). In everyday conversation, English speakers reach for 'main' first; 'primary' appears more often in formal writing. For example: 'His main complaint was the noise' (natural in any register) versus 'The primary objective of this study is to measure pollution levels' (formal academic tone).

primary ↗main ↗principal ↗chief ↗foremost ↗

Common collocations

Nouns

Adverbs

Phrases

  • primary school
  • primary education
  • primary election
  • primary care

Prepositions

  • in a primary
  • of primary importance

Etymology

LatinOld FrenchEnglish

The word 'primary' comes from the Latin word 'primarius', meaning 'of the first rank, chief, or principal'. This in turn comes from 'primus', the Latin word for 'first'. The word entered English in the 15th century through Old French ('primaire'). For centuries it was used only as an adjective meaning 'first in time or importance'. The noun sense referring to a US election appeared in the mid-19th century, when states began holding preliminary elections to select party candidates. The verb sense — to challenge an incumbent in such an election — developed in American political journalism in the late 20th century, completing the word's rare journey from an adjective that describes rank into a noun and finally a verb that describes a specific political action.