Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

WORD ORIGIN

mid-14c., "intimate, very friendly, on a family footing," from Old French famelier, from Latin familiaris "domestic, of a household;" also "familiar, intimate, friendly," dissimilated from *familialis, from familia (see family). The sense gradually broadened. Of things, from late 15c. The noun meaning "demon, evil spirit that answers one's call" is from 1580s.

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.