n an open clash between two opposing groups (or individuals)
n opposition between two simultaneous but incompatible feelings
n a hostile meeting of opposing military forces in the course of a war
n a state of opposition between persons or ideas or interests
n an incompatibility of dates or events
n opposition in a work of drama or fiction between characters or forces (especially an opposition that motivates the development of the plot)
n a disagreement or argument about something important
v be in conflict
v go against, as of rules and laws