\Then\ ([th][e^]n), adv. [Originally the same word as than.
See {Than}.]
1. At that time (referring to a time specified, either past
   or future).
         And the Canaanite was then in the land. --Gen. xii.
                                               6.
         Now I know in part; but then shall I know even as
         also I am known.                      --1 Cor. xiii.
                                               12.
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
         act.                                  --L'Estrange.
{By then}.
   (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
             Antichrist.                       --Milton.
{Now and then}. See under {Now}, adv.
{Till then}, until that time; until the time mentioned.
   --Milton.
Note: Then is often used elliptically, like an adjective, for
      then existing; as, the then administration.

\Then\, conj.
1. Than. [Obs.] --Spenser.
2. In that case; in consequence; as a consequence; therefore;
   for this reason.
         If all this be so, then man has a natural freedom.
                                               --Locke.
         Now, then, be all thy weighty cares away. --Dryden.
Syn: Therefore.
Usage: {Then}, {Therefore}. Both these words are used in
       reasoning; but therefore takes the lead, while then is
       rather subordinate or incidental. Therefore states
       reasons and draws inferences in form; then, to a great
       extent, takes the point as proved, and passes on to
       the general conclusion. ``Therefore being justified by
       faith, we have peace with God.'' --Rom. v. 1. ``So
       then faith cometh by hearing, and hearing by the word
       of God.'' --Rom. x. 17.