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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]
Perseid any of numerous meteors visible in the night sky around mid-August each year.
Persephone in Greek mythology, the daughter of Demeter and Zeus, carried off by Hades to the underworld and thereafter permitted to spend only half the year back in the world. The myth presents this cycle of loss and return as the origin of the seasons.
Perseus in Greek mythology, the son of Zeus and Danae, who slew Medusa and used her head with its fatal stare to save Andromeda from the sea monster Cetus. [2 definitions]
perseverance steadfast continuance in a course of action, task, or belief.
perseverate to manifest or experience perseveration. [2 definitions]
perseveration the pathological continuation or repetition of an action, gesture, or expression, such as a word or phrase. [2 definitions]
persevere to continue steadfastly in a task or course of action or hold steadfastly to a belief or commitment, esp. when met with opposition or difficulties; persist.
persevering steadfast in following a course of action or holding a belief; tenacious; persistent.