Both Uses

feasible
in
The Swiss Family Robinson
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My success surpassed my own expectations; the stump was entwined by the cord in such a way as to leave no doubt whatever as to the feasibility of the wonderful performances I described; and I was assailed by petitions from the boys, each anxious to possess a lasso of his own, without a moment's delay.†
Chpt 6 *

feasibility = the degree to which something is practical
The boys shouted with glee at the proposal, and though their mother thought the plan feasible enough, she confessed that she did not much like the thought of sitting in the middle of a basket, and just looking out now and then over the rim.†
Chpt 11

feasible = possible or practical

Definitions:

(1) (feasible)
possible or practical
(2) (meaning too rare to warrant focus)
Although the form feasibility (a measure of how feasible) is more often seen in print, the form feasible is seen more on standardized tests.