| perpendicular | (adjective) intersecting at or forming right angles | - |
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| (adjective) at right angles to the plane of the horizon or a base line | Synonyms: vertical |
| (adjective) so steep as to be nearly vertical | - |
| (noun) an extremely steep face | - |
| (noun) a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point | Synonyms: plumb line |
| (noun) a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting | Synonyms: English-Gothic, English-Gothic architecture, perpendicular style |
| (noun) a straight line at right angles to another line | - |
| perpendicularity | (noun) the quality of being at right angles to a given line or plane (especially the plane of the horizon) | - |
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| (noun) the relation of opposition between things at right angles | Synonyms: orthogonal opposition, orthogonality |
| perpendicularly | (adverb) in a perpendicular manner | - |
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| (adverb) straight up or down without a break | Synonyms: sheer |
| perpetrate | (verb) perform an act, usually with a negative connotation | Synonyms: commit, pull |
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| perpetration | (noun) the act of committing a crime | Synonyms: commission, committal |
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| perpetrator | (noun) someone who perpetrates wrongdoing | Synonyms: culprit |
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| perpetual | (adjective) uninterrupted in time and indefinitely long continuing | Synonyms: ceaseless, constant, incessant, never-ending, unceasing, unremitting |
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| (adjective) continuing forever or indefinitely | Synonyms: aeonian, ageless, eonian, eternal, everlasting, unceasing, unending |
| perpetually | (adverb) invariably | Synonyms: always, constantly, forever, incessantly |
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| (adverb) everlastingly; for all time | - |
| perpetuate | (verb) cause to continue or prevail | - |
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| perpetuation | (noun) the act of prolonging something | Synonyms: lengthening, prolongation, protraction |
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| perpetuity | (noun) the property of being perpetual (seemingly ceaseless) | Synonyms: sempiternity |
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| perphenazine | (noun) tranquilizer and antidepressant (trade name Triavil) sometimes used as an antiemetic for adults | Synonyms: Triavil |
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| perplex | (verb) make more complicated | Synonyms: complicate |
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| (verb) be a mystery or bewildering to | Synonyms: amaze, baffle, beat, bewilder, dumbfound, flummox, get, gravel, mystify, nonplus, pose, puzzle, stick, stupefy, vex |
| perplexed | (adjective) full of difficulty or confusion or bewilderment | - |
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| perplexedly | (adverb) in a perplexed manner | Synonyms: confoundedly |
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| perplexing | (adjective) lacking clarity of meaning; causing confusion or perplexity | Synonyms: confusing, puzzling |
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| perplexity | (noun) trouble or confusion resulting from complexity | - |
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