In AV 'ability' is either material (Le 27:8; Ezr 2:69; Ac 11:29) or personal (Da 1:4; Mt 25:15) capacity. The mod. meaning ('mental power') is not found in AV.
To one he gave five talents, to another two, to another one--to each according to his individual capacity; and then started from home.
So the disciples decided to send relief, every one in proportion to his means, to the brethren living in Judaea.