a plane figure with four angles and four sides.

an area of one hundred square feet.

consisting of eighty four.

eighty-fourth - a) preceded by eighty-three others in a series; b) designating any of the eighty-four equal parts of something; c) occurring, coming for the eighty-fourth time.

the cardinal number eighty-four; 84.

to direct a current of air toward or on with or as with a fan; to fan.