1. The chief administrative official of a prison.
2. An official charged with the enforcement of certain laws and regulations: an air raid warden.
3. Chiefly British
a. The chief executive official in charge of a port or market.
b. Any of various crown officers having administrative duties.
c. One of the governing officials of certain colleges, schools, guilds, or hospitals; a trustee.
4. The chief executive of a borough in certain states.
5. A churchwarden.
[Middle English wardein, from Old North French, from warder, to guard, of Germanic origin; see wer-3 in the Appendix of Indo-European roots.]
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