Line-height

Line-height

In typography, leading ( /ˈlɛdɪŋ/) refers to the distance between the baselines of successive lines of type. The term originated in the days of hand-typesetting, when thin strips of lead were inserted into the formes to increase the vertical distance between lines of type. The term is still used in modern page layout software such as QuarkXPress and Adobe InDesign.

In consumer-oriented word processing software, this concept is usually referred to as "line spacing" or "interline spacing."

Read more about Line-height:  Origins, Feathering