Longman Dictionary of Contemporary English
counter-
prefix
EXAMPLES FROM OTHER ENTRIES
▪ proposals and counter-proposals
The Collaborative International Dictionary
Counter-
Counter- \Coun"ter-\ (koun"t[~e]r-).
Note: [See Counter, adv. ] A prefix meaning contrary, opposite, in opposition; as, counteract, counterbalance, countercheck. See Counter, adv. & a.
Douglas Harper's Etymology Dictionary
counter-
word-forming element meaning "against; in return; corresponding," from Anglo-French countre-, French contre-, from Latin contra "opposite, contrary to, against, in return," also used as a prefix (see contra-).\n
Wiktionary
counter-
pre. in opposition to