In opposition is a term used to describe two or more entities that are in disagreement or conflict with each other. The crossword solutions for this term are ANTI (4 letters), ANTAGONISTIC (12 letters), and AVERSELY (8 letters). ANTI is a prefix meaning against or opposed to, while ANTAGONISTIC means hostile or unfriendly. AVERSELY means in a manner that is contrary or opposed to something. All three words can be used to describe a situation in which two or more entities are in opposition.