PIGEONHOLE
- A small recess for a domestic pigeon to nest in
- A small compartment, open at the front and forming part of a set, where letters or messages may be left for someone
- A similar compartment built into a desk for keeping documents in
- A category to which someone or something is assigned
- a compartment for storing and classifying papers, for leaving letters etc. ([n -S] to place in or as if in the pigeonhole of a desk [v PIGEONHOLED, PIGEONHOLING, PIGEONHOLES]