then

The word “then” means at that time (in the past or future). In plain terms, refers to a point in time, the next step in a sequence, or a logical consequence.

“Then” is pronounced thehn (/ðɛn/ in IPA).

Here is “then” used in a sentence: “We were still in school then.”

Words with a similar meaning to “then” include and then, followed by, as a result, ensuingly, therewhile and followingly.

The opposite of “then” — its antonyms — are before, previously and prior to.

“Then” is an adverb.

The word “then” comes from Old English. From Old English þonne — originally the same word as "than," which split off into a separate spelling for comparisons.

“Then” is a very common word in modern English, usually learned at around the A1 level.

"Then" relates to time or sequence — it means "at that time" or "next in a sequence of events," as in "we ate, then we left." "Than" is used only for comparisons, as in "taller than me." If you are comparing two things, use "than"; if you are talking about time or order, use "then."

"Then" is an adverb, not a conjunction, so it cannot join two complete sentences with only a comma. In formal writing, use "and then" or a semicolon: "We ate, and then we left" or "We ate; then we left." The comma-only version is common in casual writing but is technically a comma splice.

Yes. Starting a sentence with "then" is a natural way to show the next step in a sequence: "Then the lights went out." A comma after an opening "then" is optional and is usually omitted when it simply means "next."

Yes. "Back then" is a standard phrase meaning "at that time in the past," as in "life was simpler back then." It is slightly informal, so in formal writing you might prefer "at that time."