readiness

Fernald has no entry of its own for readiness; he lists it under address, dexterity, ease, power.

Where he writes about it:

It includes adroitness and discretion to know what to do or say and what to avoid; ingenuity to devise; readiness to speak or act; the dexterity that comes of practise; and tact, which is the power of fine touch as applied to human character and feeling. — from address

Aptitude (L. aptus, fit, fitted) is a natural readiness, which by practise may be developed into dexterity. — from dexterity

Ease may be either of condition or of action; facility is always of action; readiness is of action or of expected action. — from ease

Facility is always active; readiness may be active or passive; the speaker has facility of expression, readiness of wit; any appliance is in readiness for use. — from ease

Readiness in the active sense includes much of the meaning of ease with the added idea of promptness or alertness. — from ease

Expertness applies to the more mechanical processes of body and mind; we speak of the readiness of an orator, but of the expertness of a gymnast. — from ease

Competency is equal to the occasion, readiness prompt for the occasion. — from power

Our abilities include our natural capacity, faculties, and talents, with all the dexterity, skill, and readiness that can be acquired. — from power