Hence
Definition 1 of 3
Pro Tip 1/3
Time Expression
Used to describe a future point when something will happen, relative to now. I'll see you two days hence.
Pro Tip 2/3
Fixed Future
Can suggest a fixed or determined time in the future, not just any time. We shall meet again a year hence.
Pro Tip 3/3
Formal Contexts
More common in formal or literary writing, seldom used in casual conversation. This agreement expires three years hence.