(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...

(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.

(organic chemistry) Having a single azo group