1. (v. i.) To act interchangeably; to alternate; to give in return; as, to reciprocate a favor\; to move forward and backward alternately; to recur in vicissitude.

2. (v. t.) To give and return mutually; to make return for; to give in return; to interchange; to alternate; as, to reciprocate favors.

accord act in concert act together affiliate agree agree with ally alternate amalgamate answer answer to associate back and fill band band together bandy battledore and shuttlecock be in league be quits with change chime in with club together coact coalesce coequal collaborate collude combine come and go come back at commute compensate complement concert concord concur confederate consolidate conspire cooperate correspond correspond to cotton to counter counterchange do business with ebb and flow empathize equal exchange fall in with federate fuse get along get along with get back at get even with get heads together get on with get together give and take give in exchange give in return go partners hang together harmonize harmonize with hit back at hitch and hike hold together hook up identify with interchange join join in join together keep together league league together logroll make common cause match merge partner pass and repass pay back permute play ball pull together put heads together recompense repay requite respond respond to retaliate retort return return the compliment ride and tie seesaw shuttle shuttlecock sing in chorus stand together strike back swap swing switch sympathize team up teeter teeter-totter throw in together tie in tie up to-and-fro trade transpose understand one another unite unite efforts wax and wane wibble-wabble wigwag work together zigzag