What is the definition of leading in typography?

In typography, leading (pronounced “ledd-ing”) is the vertical space between two lines of text, measured from one baseline (the invisible line on which the letters sit) to the next. Leading can be adjusted to improve readability or help make text look cohesive.

Leading gets its name from early typesetting practices: when type was set by hand, typesetters would insert thin strips of lead between lines to achieve the desired spacing.

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