Glossary Term Definition
Type set with no extra leading, so that the line spacing equals the type size (e.g. 12/12); the baseline-to-baseline distance is the same as the body size.
Definition
Type set with no extra leading, so that the line spacing equals the type size. For example, 12 pt type set on 12 pt leading (12/12) is said to be set solid. The baseline-to-baseline distance is the same as the body size. Most text benefits from additional leading beyond solid.
Source
No access — Robert Bringhurst — p. 329:
Type set with no extra leading, so that the line spacing equals the type size.