Linear extension in space; increase of length. Also: an instance of this; an addition which increases the length of something.

= lengthening, n.

The action or process of lengthening something; elongation.

= extension, n.

Extension or lengthening in space or time. Cf. produce, v. 1. Now rare.

Surgery. ‘An imperfect luxation, when the ligaments are only relaxed and lengthened, but the bone is not out of place’ (New Sydenham Soc. Lexicon).

The action of lengthen, v.

Enlargement. Increase in length; prolongation, lengthening; spec. in a camera, the distance by which the front part carrying the lens can be drawn…