Definition of then :
1. At another time; later; again.
2. At that time ( referring to a time specified, either past or future).
3. In that case; in consequence; as a consequence; therefore; for this reason.
4. Soon afterward, or immediately; next; afterward.
therefore, so, consequently, at that point, either, last, wherefore, yet, soon after, all, years ago, further, sometime, and so, and then, indeed, when, also, later, again, thus, thusly, whenever, this, formerly, whence, all at once, before, before long, besides, accordingly, thereupon, hence, too, furthermore, additionally, here, likewise, suddenly, until, moreover, withal, thence, because
different time (part of speech: adjective)
then (part of speech: adjective)
that time, those days