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power structure the system or hierarchy of authority or control in politics, business, society, or the like. [2 definitions]
power switch a device used to open or close an electric connection.
power tool a tool that operates by electric power.
power up to turn on an electrical or electronic device or system, or otherwise connect it to a power source. [2 definitions]
powwow a North American Indian ceremony, usu. with ritual dancing, feasting, and chanting, performed to aid warriors in battle, cure disease, or aid the hunt. [4 definitions]
pox a disease, such as chicken pox, that is characterized by a pustular skin rash. [2 definitions]
pp. abbreviation of "pages," a plural form of "pages."
ppb abbreviation of "parts per billion."
ppm abbreviation of "parts per million."
P.P.S. abbreviation of "post postscriptum" (Latin); a second or additional postscript.
PR1 abbreviation of "Puerto Rico," a West Indies island commonwealth associated with the United States, east of the Dominican Republic.
Pr symbol of the chemical element praseodymium.
PR2 abbreviation of "public relations," the organized efforts of a corporation, organization, institution, or the like to establish a favorable image or favorable relations with the general public. [2 definitions]
pr. abbreviation of "pair" or "pairs."
practicable capable of being done or put into practice.
practical of or relating to practice and experience as opposed to theory or abstraction. [5 definitions]
practical joke a playful or mischievous trick played on someone, often causing embarrassment or discomfort.
practical joker a person who engages in practical jokes.
practically in every essential respect; virtually. [3 definitions]
practical nurse a nurse who has had some training in nursing and is often licensed by a state to provide basic care for patients, usu. under the supervision of a registered nurse.
practice an activity that is habitual or customary. [11 definitions]