Pronunciation: (top'i-kul),[key] —adj. 1. pertaining to or dealing with matters of current or local interest: a topical reference. 2. pertaining to the subject of a discourse, composition, or the like.
3. of a place; local.
4. Med.of, pertaining to, or applied externally to a particular part of the body; local: a topical anesthetic.
—n. Philately.any of a collection of different stamps treating the same subject.