Tonight vs. Night

On or during the present or coming night.

The period between sunset and sunrise, especially the hours of darkness.

This night or the night of this day.

This period considered as a unit of time

During the night following the current day.

This period considered from its conditions

(obsolete) Last night.

The period between dusk and midnight of a given day

The nighttime of the current day or date; this night.

The period between evening and bedtime.

On this present or coming night.

This period considered from its activities

On the last night past.

This period set aside for a specific purpose

The present or the coming night; the night after the present day.

The period between bedtime and morning

The present or immediately coming night

One's sleep during this period

During the night of the present day;

Nightfall

Darkness

A time or condition of gloom, obscurity, ignorance, or despair

A time or condition marked by absence of moral or ethical values

Of or relating to the night

Intended for use at night

Working during the night

Active chiefly at night

Occurring after dark

(countable) The period between sunset and sunrise, when a location faces far away from the sun, thus when the sky is dark.

The period of darkness beginning at the end of evening astronomical twilight when the sun is 18 degrees below the horizon, and ending at the beginning of morning astronomical twilight.

A period of time often defined in the legal system as beginning 30 minutes after sunset, and ending 30 minutes before sunrise.

(countable) An evening or night spent at a particular activity.

(countable) A night (and part of the days before and after it) spent in a place away from home, e.g. a hotel.

(uncountable) Nightfall.

(uncountable) Darkness (due to it being nighttime).

(uncountable) A dark blue colour, midnight blue.

A night's worth of competitions, generally one game.

Ellipsis of good night

To spend a night (in a place), to overnight.

That part of the natural day when the sun is beneath the horizon, or the time from sunset to sunrise; esp., the time between dusk and dawn, when there is no light of the sun, but only moonlight, starlight, or artificial light.

Darkness; obscurity; concealment.

Intellectual and moral darkness; ignorance.

A lifeless or unenlivened period, as when nature seems to sleep.

The time after sunset and before sunrise while it is dark outside

The time between sunset and midnight;

The period spent sleeping;

The dark part of the diurnal cycle considered a time unit;

Darkness;

A shortening of nightfall;

A period of ignorance or backwardness or gloom

Roman goddess of night; daughter of Erebus; counterpart of Greek Nyx