a slip of paper, cloth, or other material, marked or inscribed, for attachment to something to indicate its manufacturer, nature, ownership, destination, etc.

a short word or phrase descriptive of a person, group, intellectual movement, etc.

a word or phrase indicating that what follows belongs in a particular category or classification

The following definition has the label Archit.

Architecture . a molding or dripstone over a door or window, esp. one that extends horizontally across the top of the opening and vertically downward for a certain distance at the sides.

a brand or trademark, esp. of a manufacturer of phonograph records, tape cassettes, etc.

She records under a new label.

the manufacturer using such a label

a major label that has produced some of the best recordings of the year.

Heraldry . a narrow horizontal strip with a number of downward extensions of rectangular or dovetail form, usually placed in chief as the cadency mark of an eldest son.

Obsolete . a strip or narrow piece of anything.

to affix a label to; mark with a label.

to designate or describe by or on a label

The bottle was labeled poison.

to put in a certain class; classify.

Also, radiolabel. Chemistry . to incorporate a radioactive or heavy isotope into (a molecule) in order to make traceable.