1. Bearing or marked with a label or tag
   "properly labelled luggage";
   - labeled [US], tagged

1. Assign a label to; designate with a label
   "The scientist labeled each test tube carefully"; "She labeled the boxes before storing them"
    
2. Attach a tag or label to
   "label these bottles";
   - tag, mark
    
3. Officially declare a judgment on someone
   "They labelled him unfit to work here";
   - pronounce, judge
    
4. Distinguish (as a compound or molecule) by introducing a labelled atom
   "The scientists labelled the protein to observe its interactions"
    
5. Distinguish (an element or atom) by using a radioactive isotope or an isotope of unusual mass for tracing through chemical reactions
   "They labelled the carbon atoms to track their movement through the metabolic process"

See also: mark down, mark up

Type of: adjudge, attach, declare, denominate, designate, differentiate, distinguish, hold, secern [rare], separate, severalise [Brit, rare], severalize [rare], tell apart

Encyclopedia: Label