Orig: a demonstrative adverb; at that time or place; also as a conjunction, therefore:--beginning, for, from, hitherto, now, of old, once, since, then, at which time, yet.
1) then, at that time 1a) temporal expressions 1a1) then (past) 1a2) then, if...then (future) 1a3) earlier 1b) logical expressions 1b1) in that case 1b2) that (being so)