heyday

C2+ Topic:Time

US /ˈheɪˌdeɪ/ UK /ˈheɪˌdeɪ/ See IPA manual

noun

Meanings

1

noun
the period of greatest success, vigour, or popularity

In its heyday the resort welcomed thousands each summer.

Thesaurus

Synonyms

1 noun · the period of greatest... prime peak zenith pinnacle apex acme bloom flowering

Opposites

decline nadir decadence twilight

Etymology

Originally heyda, an exclamation of joy or surprise (16th century), of which the second element was later associated with day; the noun sense 'period of greatest vigor' developed by the 18th century.

Topics

Time Word Formation & Derivatives

# heyday

**Type:** Word
**Level:** C2+
**Part of speech:** noun
**IPA (US):** ˈheɪˌdeɪ
**IPA (UK):** ˈheɪˌdeɪ

## Meanings
1. the period of greatest success, vigour, or popularity

## Examples
- In its heyday the resort welcomed thousands each summer.

## Synonyms
- prime
- peak
- zenith
- pinnacle
- apex
- acme
- bloom
- flowering

## Antonyms
- decline
- nadir
- decadence
- twilight

## Etymology
Originally heyda, an exclamation of joy or surprise (16th century), of which the second element was later associated with day; the noun sense 'period of greatest vigor' developed by the 18th century.

## AI Etymology
heyday is originally heyda, an exclamation of joy or surprise (16th century), of which the second element was later associated with day; the noun sense 'period of greatest vigor' developed by the 18th century. The history explains the modern form through the named earlier word or formation, without requiring a separate speculative ancestry. In present English, the noun sense is "the period of greatest success, vigour, or popularity", so the historical development ends in a clearly identifiable modern dictionary use. Its semantic neighborhood includes prime, peak, zenith, and pinnacle, which helps locate the modern sense without adding a separate etymological claim.

## Topics
- Time
- Word Formation & Derivatives

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heyday

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