fe·ver (f??v?r)n.1. a. Abnormally high body temperature.b. Any of various diseases characterized by abnormally high body temperature.2. a. A condition of heightened activity or excitement: a fever of anticipation.b. A contagious, usually short-lived enthusiasm or craze: disco fever.v. fe·vered, fe·ver·ing, fe·vers v.tr. To effect fever in.v.intr. To be or become feverish.[Middle English, from Old English fefor and from Old French fievre, both from Latin febris.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.fever (?fi?v?) n1. (Pathology) an abnormally high body temperature, accompanied by a fast pulse rate, dry skin, etc. 2. (Pathology) any of various diseases, such as yellow fever or scarlet fever, characterized by a high temperature3. intense nervous excitement or agitation: she was in a fever about her party. vb (tr) to affect with or as if with fever[Old English f?for, from Latin febris] ?fevered adj ?feverless adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014fe?ver (?fi v?r) n. 1. an abnormally high body temperature. 2. any of various diseases in which high temperature is a prominent symptom, as scarlet fever or rheumatic fever. 3. intense nervous excitement: in a fever of anticipation. v.t. 4. to affect with or as if with fever. v.i. 5. to become feverish; have or get a fever. [before 1000; Middle English; Old English fefer