contingency (n.)

• accessory
• accident
• accidental
• addendum
• addition
• adjunct
• adventure
• appendage
• appurtenance
• aptitude
• aptness
• auxiliary
• break
• casualty
• chance
• circumstance
• collateral
• conceivability
• conceivableness
• condition
• conjuncture
• contingent
• correlation
• crisis
• crossroads
• dependence
• emergency
• event
• eventuality
• exigency
• extra
• fluke
• fortuity
• gamble
• guess
• hap
• happening
• happenstance
• hazard
• hope
• incidence
• incident
• incidental
• inessential
• interrelation
• juncture
• liability
• liableness
• likelihood
• likeliness
• materialization
• nonessential
• obligation
• occasion
• occurrence
• opportunity
• other
• pass
• pinch
• possibility
• possibleness
• potential
• potentiality
• probability
• proneness
• prospect
• question
• realization
• relativity
• secondary
• strait
• subsidiary
• supplement
• toss-up
• wager
• weakness