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fieldwork scientific research, exploration, or observation conducted in the field rather than the laboratory or classroom. [2 definitions]
fiend an evil spirit or demon; devil. [3 definitions]
fiendish of, pertaining to, or like a fiend; diabolical or extremely cruel. [2 definitions]
fierce dangerously wild, hostile, or vicious; ferocious. [4 definitions]
fiery containing, consisting of, or accompanied by fire; flaming. [4 definitions]
fiesta a festival, esp. a religious celebration in Spanish-speaking nations.
fife a small, high-pitched transverse flute, used mainly to accompany drums in military or marching music. [2 definitions]
fifteen the number represented by the Arabic numeral 15 and by the Roman numeral XV. [3 definitions]
fifteenth indicating rank or position between fourteenth and sixteenth. [3 definitions]
fifth indicating rank or position between fourth and sixth. [4 definitions]
Fifth Amendment an amendment to the U.S. Constitution that guarantees certain rights to accused criminals by providing due process of law, forbidding double jeopardy, and protecting persons from testifying against themselves.
fifth column a clandestine, subversive group working within its native country to betray it to an enemy force or nation.
fifth wheel a coupling structure, consisting of two rotating disks placed on the front axle of a cart or carriage, that supports the body while allowing it to turn, or a similar structure that acts as a coupling between the cab and trailer on a tractor-trailer. [2 definitions]
fiftieth indicating rank or position between forty-ninth and fifty-first. [3 definitions]
fifty the number represented by the Arabic numeral 50 and by the Roman numeral L. [5 definitions]
fifty-fifty shared equally by two. [3 definitions]
fig any of several broad-leafed trees native to the Mediterranean that bear oblong or pear-shaped soft fruit having many small seeds, or the fruit itself. [3 definitions]
fig. abbreviation of "figure." [2 definitions]
figeater see June bug.
fight a battle, struggle, or angry disagreement. [9 definitions]
fighter a boxer. [3 definitions]