fortuity (n.)

• accident
• adventure
• break
• casualness
• casualty
• chance
• contingency
• contingent
• destiny
• fate
• fluke
• fortuitousness
• fortune
• gamble
• hap
• happening
• happenstance
• hazard
• indeterminacy
• indeterminateness
• lot
• luck
• opportunity
• probability
• risk
• serendipity
• uncertainty