The sixteenth letter and twelfth consonant of the English alphabet, having a corresponding position in other alphabets.As a medieval numeral, 400; with a dash over it , 400,000.As a symbol: In chem., the symbol for phosphorus.In mathematics, the Greek capital II denotes a continued product.Thus, , for which Π (1 + m) is also written, denotes the product (1 + m) m (m − 1) … 3.2.1. The small Greek letter π denotes the ratio of the circumference to the diameter, or 3.14159265359 + . This notation was introduced by Euler. The other form of the Greek minuscule, ω%26, denotes in astronomy the longitude of the perihelion.An abbreviation: Of post in P. M., post meridiem, afternoon, and P. S., postscript.[lowercase] Of page (past participle standing for pages).[lowercase] In music, of piano, softly (past participle standing for pianissimo, very softly)[lowercase] In a ship's log-book, of passing showers.[lowercase] In zoology: Of partim. In dental formulas, same as pm. In ichthyology, of pectoral (fin). In echinoderms, of polyplacid.In medicine, of (Optic) papilla; pupil; pugillus, handful.n. An abbreviation of participial adjective, employed in this dictionary.n. An abbreviation of the Latin partes æquales, equal parts.n. An abbreviation of Pharmacopœia Britannica, British Pharmacopœia.n. An abbreviation of Privy Councilor; of police constable.n. An abbreviation of Pharmacopœia Dublinensis, Dublin Pharmacopœia.n. An abbreviation of Pharmacopœia Edinensis, Edinburgh Pharmacopœia; of Protestant Episcopal.n. An abbreviation: of post meridiem, ‘after noon or midday’ (also P. M., p. m.): frequently used as synonymous with afternoon or evening;n. of postmaster;n. of peculiar meter.n. An abbreviation: of post-office;n. (nautical) of petty officer.n. An abbreviation of postscript; (theatrical) of prompt-side.The initial of pressure, used in formulæ for fluid pressure, as of liquids or gases upon an area. In British and American writings it is usually expressed in pounds per square inch or pounds per square foot, the zero of pressures being the vacuum line as given by the barometer, or about 14.7 pounds below the pressure of the atmosphere. In metric units it is usually expressed in kilograms per square centimeter.In mechan., a symbol for power.In psychophysics, the symbol for the Fechnerian time-error.An abbreviation: Of population.Of the Latin pars, apart.[lowercase or cap.] Of participle.[lowercase or cap.] Of past.Of the Latin pater, father.[lowercase or cap.] Of penny.[lowercase or cap.] Of pint.[lowercase or cap.] Of pipe.[lowercase or cap.] Of pole.Of the Latin pondere, by weight.In electro-technics, of power.Of president.Of prince.Of professor.An abbreviation of Post Adjutant.An abbreviation of particular average, a term used in marine-insurance policies. See average, n., 1. .n. An abbreviation of the Latin Philosophiæ Baccalaureus, Bachelor of Philosophy;n. of Primitive Baptist.n. An abbreviation of the Latin Patres Conscripti, Conscript Fathers;n. of Perpetual Curate;n. [lowercase] of the Latin per centum, by the hundred;n. of the Latin pondus civile, avoirdupois weight;n. of Post Commander;n. [lowercase] of post- or postal-card;n. [lowercase] of the Latin post consulatum, after the consulship;n. of Principal Conductor;n. of Privy Council.n. An abbreviation of potential difference;n. of the Latin Philosophiæ Doctor, Doctor of Philosophy.n. An abbreviation of Presiding Elder.n. An abbreviation of the Italian piu forte, a little loudern. [caps.] of Procurator-Fiscal.n. An abbreviation of Past Grandn. of the Latin Pharmacopœia Germanica, German Pharmacopœia.n. In ceramics, the abbreviation of ‘Paris granite,’ a trade-name.n. An abbreviation of Philippine Islands.n. An abbreviation of Justice of the Peacen. of Police Justicen. of Presiding Judgen. of Probate Judge.n. An abbreviation of Paradise Lostn. of Poet Laureaten. [lowercase or cap.] in psychology, of partial limen.An abbreviation of Pacific Mailof Past Masterof Past Midshipmanof Paymaster.n. An abbreviation of Postal Ordern. of Province of Ontario.n. An abbreviation of Parish Priest;n. of the Latin Paler Patriæ, Father of his Country;n. [lowercase] in law, of per procuration, done by proxy;n. of the Latin punctum proximum, nearest point (namely, of accommodation to which the eye can adjust itself).n. An abbreviation of Previous Question;n. of Province of Quebec.n. An abbreviation of the Latin Populus Romanus, the Roman People;n. of Porto Rico;n. of the Latin punctum remotum, farthest point (namely, of accommodation to which the eye can adjust itself).An abbreviation [lowercase] of passed School of Instruction (of Officers);[capitalized] of Permanent Secretary;[capitalized] of Privy Seal.An abbreviation [lowercase or cap.] of post-townof pupil-teacher.n. An abbreviation of post-village.