Angle that is smaller than a right angle (less than 90Â°). Angle formed by two lines or two perpendicular planes that measures 90Â°. Symbol denoting that a straight line meets another at a right angle. Symbol denoting that two straight lines do not remain at a constant distance from one other. Symbol denoting that two straight lines remain at a constant distance from one another.
Constriction vs. Dilation. Constriction and dilation are opposite, but related, processes in the body. Whereas dilation is an opening or widening of a structure or passageway to increase material flow, constriction leads to a decrease in material flow by closing the passage.
Princeton's WordNet(0.00 / 0 votes)Rate these antonyms: 1  constriction, bottleneck, chokepoint(noun) a narrowing that reduces the flow through a channel. 2  constriction, coarctation(noun) tight or narrow compression. 3  constriction, tightness(noun) a tight feeling in some part of the body.  constriction(noun) the action or process of compressing.