WordNet sense 1 (a unit of magnetomotive force equal to 0.7958 ampere-turns):

GB, gi

WordNet sense 2 (a librettist who was a collaborator with Sir Arthur Sullivan in a famous series of comic operettas (1836-1911)):

Sir William Gilbert, William S. Gilbert, William Schwenk Gilbert, William Gilbert

WordNet sense 3 (English navigator who in 1583 established in Newfoundland the first English colony in North America (1539-1583)):

Humphrey Gilbert, Sir Humphrey Gilbert

WordNet sense 4 (United States architect who influenced the development of the skyscraper (1859-1934)):

Cass Gilbert