Etymology
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then (adv.)

adverb of time, Old English þanne, þænne, þonne, from Proto-Germanic *thana- (source also of Old Frisian thenne, Old Saxon thanna, Dutch dan, Old High German danne, German dann), from PIE demonstrative pronoun root *to- (see the).

As a conjunction, "in that case, therefore," in Old English. As an adjective, "being at that time," from 1580s. As a noun from early 14c. For further sense development, see than. Similar evolutions in other Germanic languages; Dutch uses dan in both senses, but German has dann (adv.) "then," denn (conj.) "than." Now and then "at various times" is attested from 1550s; earlier then and then (c. 1200).

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Definitions of then
1
then (adv.)
subsequently or soon afterward (often used as sentence connectors);
go left first, then right
we watched the late movie and then went to bed
first came lightning, then thunder
then he left
Synonyms: so / and so
then (adv.)
in that case or as a consequence;
then you'll be rich
you've made up your mind then?
if he didn't take it, then who did?
the case, then, is closed
keep it then if you want to
then (adv.)
at that time;
science as it was then taught
I was young then
prices were lower back then
2
then (n.)
that time; that moment;
we will arrive before then
we were friends from then on
3
then (adj.)
at a specific prior time;
the then president
From wordnet.princeton.edu