The Collaborative International Dictionary of English v.0.48:
Then \Then\ ([th][e^]n), adv. [Originally the same word as than.
1. At that time (referring to a time specified, either past
And the Canaanite was then in the land. --Gen. xii.
Now I know in part; but then shall I know even as
also I am known. --1 Cor. xiii.
2. Soon afterward, or immediately; next; afterward.
First be reconciled to thy brother, and then come
and offer thy gift. --Matt. v. 24.
3. At another time; later; again.
One while the master is not aware of what is done,
and then in other cases it may fall out to be own
(a) By that time.
(b) By the time that. [Obs.]
But that opinion, I trust, by then this
following argument hath been well read, will be
left for one of the mysteries of an indulgent
Now and then. See under Now, adv.
Till then, until that time; until the time mentioned.
Note: Then is often used elliptically, like an adjective, for
then existing; as, the then administration.