aptness

The pictures are distinguished for their aptness and perfect illustrative character.

From her tenderest years, she discovered a wonderful aptness, and a vehement desire, for acquiring languages.

I have, many times, and I never see such a rock without thinking of its aptness as an illustration of this Socialist philosophy.

The rapidity and sinuosity of its motions, its quick spring and sharp recoil, prove the aptness of the illustration.

Sometimes they enshrine a pun or a conceit, or depend for their aptness upon an assonance.