اتفاقدیکشنری فارسی به انگلیسیalliance, chance, circumstance, coincidence, contingent, event, incident, occasion, occurrence, oneness, uncertainty, unity
برخورددیکشنری فارسی به انگلیسیbump, clash, conflict, crisscross, encounter, friction, impact, incident, jostle, smash, stroke, tangle