re-enˈtrance noun

1. The act or achievement of entering again
2. The fact of being re-entrant (in this sense also re-enˈtrancy)

re-enˈtrant adjective

1. Re-entering, opp to salient
2. Reflex (mathematics)
3. Returning upon itself at the ends (electronics)

1. A re-entering angle
2. A valley, depression, etc running into a main feature
3. The concavity between two salients

re-enˈtry noun

1. Entering again, esp the action of a spacecraft entering the earth's atmosphere again
2. Resumption of possession (law)
3. The re-opening of an oil well for further drilling
4. A card allowing a hand to take the lead again

re-entry corridor noun

A narrow corridor available to a spacecraft returning to Earth, bounded by excessive heating below and low atmospheric density above, preventing slowdown