Pronunciation: (u-genst', u-gānst'),[key] —prep. 1. in opposition to; contrary to; adverse or hostile to: twenty votes against ten; against reason. 2. in resistance to or defense from: protection against burglars. 3. in an opposite direction to: to ride against the wind. 4. into contact or collision with; toward; upon: The rain beat against the window. 5. in contact with: to lean against the wall. 6. in preparation for; in provision for: money saved against a rainy day. 7. having as background: a design of flowers against a dark wall. 8. in exchange for; as a balance to or debit or charge on: He asked for an advance against his salary. 9. in competition with: a racehorse running against his own record time. 10. in comparison or contrast with: a matter of reason as against emotion. 11. beside; near; before: The car is against the building. 12. over against, in contrast with: the rich over against the poor.