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lunar day

noun · n

Simple meaning

The period of time taken for the moon to make one full rotation on its axis.

Pronunciation

Say it like this:

loonerday

Say the bold part a little louder.

US device voice
IPA pronunciation (US)

ˈlunɚˈdeɪ

This word is pronounced essentially the same in American and British English, so one transcription covers both.

IPA (International Phonetic Alphabet) is a standard way of writing speech sounds.

Word Review

Definition

Everyday modern meanings first, grouped by part of speech.

noun

  1. The period of time taken for the moon to make one full rotation on its axis (about 27.3 sidereal days)

n

  1. A lunar day is the time it takes for Earth's Moon to complete on its axis one synodic rotation, meaning with respect to the Sun.

Word Aura™

How this word commonly comes across.

Aura for this meaning

This meaning: The period of time taken for the moon to make one full rotation on its axis (about 27.3 sidereal days)

Used this way, lunar day is a specialist word that usually carries little praise or criticism of its own. It turns up most in technical or specialist writing contexts.

Emotional tone
Neutral
Formality
Specialist/technical
Intensity
Not strongly marked
How common
Specialized
Connotation
Clinical and technical
Usage feel
Technical and specialized

Where it naturally appears

  • Technical/specialist writing

Usage note

In general conversation this sense usually needs explaining — outside its field, people reach for a plainer word.

Word Aura describes common impressions, not a measurement. Tone changes with sentence, speaker, relationship and situation.

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Dictionary data from Wiktionary via the Free Dictionary API. Simple meanings, combinations and word intelligence are built from verified reference data, no AI is used to load this page.