diurnal

DIURNAL, a. [L., daily.]

1. Relating to a day; pertaining to the daytime; as diurnal heat; diurnal hours.

2. Daily; happening every day; performed in a day; as a diurnal task.

3. Performed in 24 hours; as the diurnal revolution of the earth.

4. In medicine, an epithet of diseases whose exacerbations are in the day time; as a diurnal fever.

DIURNAL, n. A day-book; a journal. [See Journal, which is mostly used.]