aptitude (n.)

• ability
• acuity
• acuteness
• admissibility
• adroitness
• affinity
• animus
• applicability
• appositeness
• appropriateness
• aptness
• bent
• bias
• brightness
• brilliance
• capability
• capacity
• cast
• chance
• character
• cleverness
• constitution
• contingency
• delight
• dexterity
• diathesis
• disposition
• docility
• eagerness
• eccentricity
• esprit
• eventuality
• expectation
• facility
• faculty
• felicity
• fitness
• flair
• genius
• gift
• grain
• idiosyncrasy
• inclination
• individualism
• intellect
• intelligence
• keenness
• kidney
• leaning
• liability
• liableness
• likelihood
• likeliness
• liking
• make
• makeup
• malleability
• mettle
• mind
• mind-set
• mold
• motivation
• nature
• nimbleness
• nous
• obligation
• odds
• outlook
• penchant
• plasticity
• pliability
• possibility
• predilection
• predisposition
• preference
• prejudice
• presumption
• probabilism
• probability
• proclivity
• proneness
• propensity
• propriety
• prospect
• qualification
• quick-wittedness
• quickness
• readiness
• receptivity
• relevance
• savvy
• set
• sharpness
• slant
• smartness
• smarts
• stamp
• strain
• streak
• stripe
• suitability
• suitableness
• susceptibility
• talent
• temper
• temperament
• tendency
• tropism
• turn
• twist
• type
• verisimilitude
• warp
• weakness
• willingness