in power (a) in a position of authority, in government; †(b) Scottish able, competent (to do something) (obsolete); †(c) in potentiality, in posse…

of power: able, capable, competent. Obsolete.

of force: with infinitive, strong or powerful enough, able to do something. Cf. 1b 3b 7c 8b.

Hence to be in, put intoor out of a capacity: i.e. a position which enables, or renders capable. Obsolete.

in estate: in a position, able (to do something). Obsolete. rare.