acquiesce
Meaning: to agree without protesting
Usage: After hearing the class’s reasons, the teacher acquiesced to their request for more time.
accede
Meaning: to agree
Usage: When the class asked the teacher whether they could play baseball instead of learn grammar they expected him to refuse, but instead he acceded to their request.
accord
Meaning: an agreement
Usage: After much negotiating, England and Iceland finally came to a mutually beneficial accord about fishing rights off the coast of Greenland.
consensus
Meaning: an agreement of opinion
Usage: The jury was able to reach a consensus only after days of deliberation.
collusion
Meaning: secret agreement, conspiracy
Usage: The three law students worked in collusion to steal the final exam.