attribute:
competence.
noun:
effectiveness,
knack,
fitness,
genius,
efficaciousness,
potency,
endowment,
competency,
power,
sinew,
flair,
suitableness,
suitability,
ability,
capability,
capacity,
efficiency,
puissance,
effectualness,
aptitude,
strength,
gift,
talent,
adequacy,
bent.