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pernickety variant of persnickety.
perorate to make a long speech or speak bombastically. [2 definitions]
peroration the concluding part of a speech in which there is a summing up of the principal points. [2 definitions]
peroxidase any of a group of enzymes that catalyzes the oxidation of various substances by a peroxide.
peroxide hydrogen peroxide. [3 definitions]
perpendicular at or forming a right angle to or with an intersecting line or plane. [7 definitions]
perpetrate to commit or carry out (a crime, act of mischief, or the like). [2 definitions]
perpetual lasting or continuing forever. [4 definitions]
perpetual motion the movement of a hypothetical device which, once put in motion, would operate indefinitely by creating its own energy in excess of that expended.
perpetuate to cause to last or be remembered.
perpetuity the state or quality of being perpetual. [4 definitions]
perplex to puzzle, confuse, or cause uncertainty in the mind of (a person). [2 definitions]
perplexed puzzled, confused, or uncertain. [2 definitions]
perplexing causing difficulty in understanding or in figuring out a solution or a way to proceed.
perplexity the condition of being puzzled, confused, or uncertain. [3 definitions]
perquisite a payment or benefit in addition to the wages or salary associated with a position. [2 definitions]
pers. abbreviation of "person."
per se (Latin) in or by itself or themselves; intrinsically.
per second per second a unit that expresses the rate of change of a rate of change, such as acceleration, which is the rate of change of velocity.
persecute to subject (esp. those belonging to a different political, religious, or racial group) to persistent harassment, punishment, or ill-treatment. [2 definitions]
persecution the act of persecuting, or the condition or fact of being persecuted. [2 definitions]