1 then /ˈðɛn/ adverb
1 then
Learner's definition of THEN
: at that time : at the time mentioned
used to indicate what happened or happens next
used to indicate what should be done next
used to indicate something more that must be done or thought of
used to indicate what must be true or what must or should happen if something else is true or happens
Then is often omitted following if.
used to say or ask about what appears to be true based on what has happened or been said
used to say what has been agreed to or decided
somewhat formal used to make a final statement that refers back to the things that have just been mentioned or described
used after words like all right and OK at the beginning of a statement

and then some

see 2some

but then

see 1but

even then

see 2even

(every) now and then

see 1now

then and there

or chiefly British there and then
: immediately at that place
2 then /ˈðɛn/ noun
2 then
Learner's definition of THEN
: that time
3 then /ˈðɛn/ adjective
3 then
Learner's definition of THEN
always used before a noun
: existing at or belonging to the time mentioned