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full moon

full moon

116 1.2
A time when the Moon's whole face looks bright from Earth
  • noun
  • /fʊl muːn/
translation icon : luna llena
  • The ideal field trip was taken on the evening before the full moon in October.
  • see the full moon
  • the full moon rises
  • bright full moon

When they say there's a full moon, people go off.

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Examples

  • Is today the day of the full moon?

  • The evening is perfectly clear, and there is a full moon rising slowly and large behind them.

    Fiction book (1991)
  • So first of all, the full moon at night is crazy bright.

  • And every time I look at the full moon, I think, wow, we put people on the moon.

  • Then she realized it was the full moon rising on the eastern horizon.

    Fiction book (1994)
  • By the light of the full moon, she and Glenn took an ambulance to the hospital.

    Academic text (2001)
  • Now the light of the full moon gleamed on the glass walls of the greenhouse.

    Fiction book (1994)
  • The full moon illuminated the night sky, creating a beautiful scene for everyone to see.

  • On the evening of the full moon, people gathered outside to admire its bright glow.

  • The full moon is a perfect time for stargazing, as its light can make other stars harder to see.

Synonyms

full
vsfull moon
  • Archaic
1 2.4

The time when the Moon looks completely round and bright

is the longer established phrase for that lunar phase rather than a short form
full-of-the-moon
vsfull moon
6.5

The time when the Moon looks fully round and very bright

is the unhyphenated standard phrase for the same lunar phase
3.4

A time when the Moon looks completely lit in the night sky

is the concise term for that same lunar phase

Antonyms

9 2.8

A thin crescent of the Moon that first appears after a dark period

How Bright

supermoon
2 4.9
full moon
116 1.2
half-moon
1 2.6
crescent
30 3.5
new moon
9 2.8

Surface Forms

full moon singular
full moons plural

Morphology

full + moon

The meaning is directly compositional: 'full' (completely filled/entire) + 'moon' (Earth's satellite) yields the phase when the Moon appears fully illuminated. This construction is semantically transparent and has clear cross-linguistic parallels (e.g. Spanish 'luna llena', French 'pleine lune'), so a B1 learner who knows both words will readily infer the meaning.

Etymology

Full moon comes from the sight of the moon looking completely full and bright when the sun lights its whole face. That's why 'full moon' means the time when the moon's whole face is visible and shines at night.