Definition of then:

part of speech: adverb

At that time, referring to a specified time either past or future; soon afterward; therefore: by then, by that time: till then, until that time.

part of speech: conjunction

In that case; in consequence.

Usage examples:

• Then with a sudden access of her new dignity. in "".

• They did it then William Johnson Galloway in "The Operatic Problem".

• Then the three joined Barton Reeve. Ralph Bonehill in "Leo the Circus Boy".

• Then will you see about it all, Dick? Marie Belloc Lowndes in "Jane Oglander".