| day | (noun) a period of opportunity | - |
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| (noun) time for Earth to make a complete rotation on its axis | Synonyms: 24-hour interval, mean solar day, solar day, twenty-four hour period, twenty-four hours |
| (noun) a day assigned to a particular purpose or observance | - |
| (noun) the time after sunrise and before sunset while it is light outside | Synonyms: daylight, daytime |
| (noun) a point or period in time | - |
| (noun) the recurring hours when you are not sleeping (especially those when you are working) | - |
| (noun) an era of existence or influence | - |
| (noun) the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day | Synonyms: sidereal day |
| (noun) the period of time taken by a particular planet (e.g. Mars) to make a complete rotation on its axis | - |
| daybed | (noun) a long chair; for reclining | Synonyms: chaise, chaise longue |
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| (noun) an armless couch; a seat by day and a bed by night | Synonyms: divan bed |
| daybook | (noun) an accounting journal as a physical object | Synonyms: ledger |
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| (noun) a ledger in which transactions have been recorded as they occurred | Synonyms: journal |
| dayboy | (noun) a day boarder who is a boy | - |
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| daybreak | (noun) the first light of day | Synonyms: aurora, break of day, break of the day, cockcrow, dawn, dawning, dayspring, first light, morning, sunrise, sunup |
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| daycare | (noun) childcare during the day while parents work | Synonyms: day care |
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| daydream | (noun) absentminded dreaming while awake | Synonyms: air castle, castle in Spain, castle in the air, daydreaming, oneirism, reverie, revery |
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| (verb) have a daydream; indulge in a fantasy | Synonyms: dream, stargaze, woolgather |
| (verb) have dreamlike musings or fantasies while awake | Synonyms: moon |
| daydreamer | (noun) someone who indulges in idle or absentminded daydreaming | Synonyms: woolgatherer |
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| daydreaming | (noun) absentminded dreaming while awake | Synonyms: air castle, castle in Spain, castle in the air, daydream, oneirism, reverie, revery |
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| dayflower | (noun) any plant of the family Commelinaceae | Synonyms: spiderwort |
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| dayfly | (noun) slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days | Synonyms: mayfly, shadfly |
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| daygirl | (noun) a day boarder who is a girl | - |
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| daylight | (noun) light during the daytime | - |
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| (noun) the time after sunrise and before sunset while it is light outside | Synonyms: day, daytime |
| daylily | (noun) any of numerous perennials having tuberous roots and long narrow bladelike leaves and usually yellow lily-like flowers that bloom for only a day | Synonyms: day lily |
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| daylong | (adjective) lasting through an entire day | - |
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| (adverb) during the entire day | Synonyms: all day long |
| days | (noun) the time during which someone's life continues | Synonyms: years |
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| dayspring | (noun) the first light of day | Synonyms: aurora, break of day, break of the day, cockcrow, dawn, dawning, daybreak, first light, morning, sunrise, sunup |
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| daystar | (noun) a planet (usually Venus) seen just before sunrise in the eastern sky | Synonyms: Lucifer, morning star, Phosphorus |
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| daytime | (noun) the time after sunrise and before sunset while it is light outside | Synonyms: day, daylight |
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