Leading
Also: line spacing, line height
The distance from one line’s baseline to the next, in points. Type set at 11 pt on 14 pt leading is written 11/14 and said “eleven on fourteen”.
Snow came in the night, and by morning it had filled the lane to the top of the gate. My mother stood at the kitchen window with her coat still on, as if she had meant to go out and the weather had changed her mind. We did not talk about my father.
Comfortable: about 120 to 145% of the type size. Designers write it as size over leading, 11/14 pt.