1 adjective (only before noun)
1 a given time, date etc is one that has been previously arranged: At a given time we'll all start shouting and cheering.
2 at any given time/point etc at any particular time, point etc: The distance from the centre of a circle to the edge is the same at any given point.
3 be given to (doing) sth to tend to do something, especially something that you should not do: She is given to making wild accusations.
4 take sth as given to base your argument on the belief that something is clearly true
2 preposition used to say that something is not surprising when you consider the situation it happened in; considering 2: Given the circumstances, you've coped well. (+ that): Given that there was so little time, I think they've done a good job. 3 noun (C) formal a basic fact that you accept as being true 4 the past participle of give

Longman dictionary of contemporary English. 2004.