v. & n.
v.tr. 1 (of two people) exchange (things) with each other. 2 put each of (two things) in the other's place; alternate.
n. 1 (often foll. by of) a reciprocal exchange between two people etc. 2 alternation (the interchange of woods and fields). 3 a road junction designed so that traffic streams do not intersect. interchangeable adj. interchangeability n. interchangeableness n. interchangeably adv.
[ ME f. OF entrechangier (as INTER-, CHANGE) ]