The spreading abroad, extension, expansion (of immaterial or abstract things). archaic.

The dissemination, advancement, or promotion of a belief, idea, practice, etc.; (in later use also) the spreading of lies, scandal, etc.; an…

The action of dilate, v.2, in various senses; enlargement, expansion.

Diffusion, propagation. Obsolete. Cf. enlarge, v. 3a.

= dilatation, n. 2. Obsolete.

figurative. An influence, effect, or manifestation considered as emanating like rays.

The office or position of factor; (also) the term of office of a factor. Also figurative and in figurative contexts.

Radiant beauty or splendour; lustre. In later use figurative: influence, esp. cultural or intellectual; (cultural) diffusion.