1then 
/ˈðɛn/ adverb
/ˈðɛn/ adverb 1 : at that time : at the time mentioned
▪ It was then believed (that) the Earth was flat. ▪ She lived in the Soviet Union, as it then was called. ▪ Just then he walked in. ▪ Back then, he was living in New York. 2 a — used to indicate what happened or happens next ▪ He walked down the street, then turned the corner. ▪ First the clowns come out, (and) then the elephants and lions (come out).
b — used to indicate what should be done next ▪ “Take your first right, (and) then turn left at the light,” he said. ▪ Bring the soup to a boil, then turn down the heat and let it simmer for half an hour.
c — used to indicate something more that must be done or thought of ▪ We need to choose the menu, rent a banquet hall, and then there are the invitations to send. 3 a — used to indicate what must be true or what must or should happen if something else is true or happens ▪ If you were there, then you must have seen him. ▪ If it rains, then we can't go. ▪ “It's raining.” “Then we can't go.” ▪ “He confessed.” “The case is closed, then.” ▪ If you want it, then take it. = Take it, then, if you want it. ▪ Hurry, then, if you want to catch the bus. ▪ What if there should be a fire? What then? [=what will happen then?] ◊Then is often omitted following if.
▪ If it rains, (then) we can't go.
b — used to say or ask about what appears to be true based on what has happened or been said ▪ You did go, then, after all. ▪ Your mind is made up, then?
c — used to say what has been agreed to or decided ▪ OK, then, I'll see you at seven o'clock.
d somewhat formal — used to make a final statement that refers back to the things that have just been mentioned or described ▪ These, then, are the things you must do. ▪ All of us, then, must accept some blame for these problems. 4 — used after words like all right and OK at the beginning of a statement ▪ All right, then, let's get started.
▪ It was then believed (that) the Earth was flat. ▪ She lived in the Soviet Union, as it then was called. ▪ Just then he walked in. ▪ Back then, he was living in New York.
b — used to indicate what should be done next ▪ “Take your first right, (and) then turn left at the light,” he said. ▪ Bring the soup to a boil, then turn down the heat and let it simmer for half an hour.
c — used to indicate something more that must be done or thought of ▪ We need to choose the menu, rent a banquet hall, and then there are the invitations to send.
▪ If it rains, (then) we can't go.
b — used to say or ask about what appears to be true based on what has happened or been said ▪ You did go, then, after all. ▪ Your mind is made up, then?
c — used to say what has been agreed to or decided ▪ OK, then, I'll see you at seven o'clock.
d somewhat formal — used to make a final statement that refers back to the things that have just been mentioned or described ▪ These, then, are the things you must do. ▪ All of us, then, must accept some blame for these problems.
and then some — see 2some
but then — see 1but
even then — see 2even
(every) now and then — see 1now
then and there or chiefly Brit there and then
: immediately at that place
▪ I decided (right) then and there that I would accept the offer. ▪ I made up my mind then and there.
▪ I decided (right) then and there that I would accept the offer. ▪ I made up my mind then and there.
