The noun then has 1 sense (first 1 from tagged texts)
1. (6) then -- (that time; that moment; "we will arrive before then"; "we were friends from then on")
Overview of adj then
The adj then has 1 sense (first 1 from tagged texts)
1. (1) then -- (at a specific prior time; "the then president")
Overview of adv then
The adv then has 3 senses (first 3 from tagged texts)
1. (334) then, so, and so, and then -- (subsequently or soon afterward (often used as sentence connectors); "then he left"; "go left first, then right"; "first came lightning, then thunder"; "we watched the late movie and then went to bed"; "and so home and to bed")
2. (117) then -- (in that case or as a consequence; "if he didn't take it, then who did?"; "keep it then if you want to"; "the case, then, is closed"; "you've made up your mind then?"; "then you'll be rich")
3. (87) then -- (at that time; "I was young then"; "prices were lower back then"; "science as it was then taught")