| Main Entry: | |
| Part of Speech: | noun |
| Definition: | part of day after sundown and before sunrise |
| Synonyms: | after dark, after hours, bedtime, before dawn, black*, blackness, dark, dark hours, darkness, dead of night, dim, dusk to dawn, duskiness, evening, eventide, gloom, midnight, nightfall, nighttide, nighttime, obscurity*, pitch dark, twilight, witching hour |
| Antonyms: | day |
| Main Entry: | dusk |
| Part of Speech: | noun |
| Definition: | early evening |
| Synonyms: | dark, dimday, dimmet, eventide, gloaming, gloom, night, nightfall, sundown, sunset, twilight |
| Antonyms: | dawn |
| Main Entry: | nocturnal |
| Part of Speech: | adjective |
| Definition: | happening at night |
| Synonyms: | after dark, late, night, night-loving, nightly, nighttime |
| Notes: | nocturnal means belonging to or active during the night; diurnal means belonging to or active during the day |
| Main Entry: | twilight |
| Part of Speech: | noun |
| Definition: | onset of darkness at end of day |
| Synonyms: | afterglow, afterlight, crepuscular light, decline, dimness, dusk, early evening, ebb, end, evening, eventide, gloaming, half-light, last phase, late-afternoon, night, nightfall, sundown, sunset |
| Antonyms: | daybreak, sunrise |
| Main Entry: | eve |
| Part of Speech: | noun |
| Definition: | night before |
| Synonyms: | brink, evening, evening before, night, threshold, verge, vigil |
| Main Entry: | nighttime |
| Part of Speech: | noun |
| Definition: | darkness |
| Synonyms: | bedtime, dusk, midnight, night, nightfall |
| Main Entry: | duskiness |
| Part of Speech: | noun |
| Definition: | dark |
| Synonyms: | blackness, darkness, dimness, dusk, murkiness, night, sundown, sunset, twilight |
| Main Entry: | murkiness |
| Part of Speech: | noun |
| Definition: | dark |
| Synonyms: | caliginosity, darkness, dead of night, dimness, dusk, duskiness, evening, gloom, midnight, murk, night, nightfall, nighttime, obscureness, obscurity, opacity, semidarkness, shade, shadows, twilight, witching hour |
| Main Entry: | obscureness |
| Part of Speech: | noun |
| Definition: | dark |
| Synonyms: | caliginosity, darkness, dead of night, dimness, dusk, duskiness, evening, gloom, midnight, murk, murkiness, night, nightfall, nighttime, obscurity, opacity, semidarkness, shade, shadows, twilight, witching hour |