(law) A year in the reign of a monarch, beginning on the day of accession, the set of which are numbered ordinally. Formerly laws in the United Kingdom were identified in part by the regnal year of...

(organic chemistry) Having a single azo group

(obsolete) A little cloud.

Used other than figuratively or idiomatically: see big, girl. / (idiomatic, informal) An adult female. / (informal) An older girl or grown-up girl; a girl who is no longer an infant.