keynote

keynote — noun

1. the main idea or message that runs through a speech, book, or event, giving it a

1.nounB2
Definition

the main idea or message that runs through a speech, book, or event, giving it a clear focus and direction

Example

Élise opened with a short story that introduced the keynote of the entire conference.

keynote of [event] as central theme

The keynote of the speech on climate change was the urgent need for local action.

the keynote of [speech/document]

Common collocations
  • the keynote of something
  • form the keynote
  • provide the keynote
  • sound the keynote of
Synonyms
  • theme

    more general; keynote suggests the single most important or defining idea

  • core

    focuses on the essential centre of something rather than its guiding idea

  • gist

    refers to the general meaning rather than a central principle or mood

  • main thread

    emphasises continuity through a piece of writing or speech

Antonyms
  • aside

    a remark that is off the main topic

  • digression

    a temporary move away from the main subject

Grammar Patterns

the keynote of [something]

Usage Note

This sense is almost always singular and used with the definite article the or a possessive determiner.

Common Mistakes

The keynotes of her speech were hard work.
The keynote of her speech was hard work.
this sense is typically singular even when the theme has multiple parts.

2. in music, the starting note of a scale from which the scale's key takes its name

2.nounC1
Definition

in music, the starting note of a scale from which the scale's key takes its name

Example

In C major, the keynote is C and all other notes relate back to it.

Yuna practised identifying the keynote of each scale before playing the full set of notes.

identifying the keynote of each scale

Common collocations
  • the keynote of a scale
  • identify the keynote
  • finish on the keynote
  • return to the keynote
Synonyms
  • tonic

    the technical term for the keynote; more common in formal music theory

  • fundamental

    used for the lowest note of a chord rather than the tonal centre of a key

Grammar Patterns

the keynote of [a scale]

Usage Note

Also called the tonic. In Western music theory, the keynote is the tonal centre of a piece — the note that feels like 'home.' This sense is mainly found in music education and theory contexts.

3. the most important speech at a conference or formal gathering, which establishes

3.nounB2
Definition

the most important speech at a conference or formal gathering, which establishes the main topic and sets the tone for the event

Example

Professor Renata Okonkwo will deliver the keynote at the international education summit next week.

deliver the keynote — most common verb collocation

The organisers chose a Nobel laureate to give the keynote address on the opening morning.

keynote address as attributive noun

Common collocations
  • deliver a keynote
  • give a keynote
  • keynote address
  • keynote speech
  • keynote speaker
Synonyms
  • keynote address

    full form; more formal than keynote alone

  • opening address

    focuses on timing (first speech) rather than importance or theme-setting

  • plenary talk

    a talk given to the whole conference audience, not necessarily the most important one

Grammar Patterns

keynote speech

keynote address

give a keynote

Usage Note

Often used as an attributive noun before address or speech (keynote address, keynote speech). The verb give or deliver is the most common collocation.

Common Mistakes

He gave a keynote in the meeting.
He gave a keynote address at the medical conference.
keynote in the 'speech' sense usually implies a large formal event, not a routine meeting.

keynote — verb

Word family

  • keynoter
    nounC1
  • keynote address
    nounB2
  • keynote speaker
    nounB2

Synonym discussion

Sense: noun/1

Keynote, theme, core, gist, and main thread all refer to the central element of something, but they differ in scope and emphasis. Keynote suggests the single most defining or guiding idea — it is what gives everything else direction and purpose. Theme is broader and more neutral: a speech can have several themes, but only one keynote. Core points to the essential centre that everything else depends on, like the core of an apple; it emphasises necessity rather than direction. Gist refers to the general meaning or main point of what someone said, not a guiding principle. Main thread highlights continuity — the idea that runs through a longer piece and holds it together. For example, 'The keynote of the conference was sustainability, but the gist of the first session was that companies lack clear targets.'

theme ↗core ↗gistmain thread

Common collocations

Nouns

Phrases

  • deliver the keynote
  • give a keynote
  • keynote address
  • keynote speaker

Prepositions

Etymology

EnglishMiddle EnglishOld FrenchLatin

A compound of key and note, first recorded in English in the late 1700s as a music term referring to the first note of a musical scale — the note that establishes the key. By the mid-1800s the word had developed a figurative sense: the central idea or guiding principle of something, especially a speech or piece of writing. The use of keynote address (or speech) for the main talk at a conference became common in American English in the early 1900s.