A Priori

Entertainment / Literature / A Priori: In rhetoric, logic, and philosophy, an argument is said to be a priori if its truth can be known or inferred independently of any direct perception. Logic, geometry, and mathematics are usually held as such (Palmer 381).
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Planned Amortization Class (PAC)

Business / Finance / Planned Amortization Class (PAC): (1) The class of CMO that has the most stable cash flows and the lowest prepayment risk of any class of CMO Because of a stable cash flow, it is considered the least risky CMO (2) A CMO bond class tha MORE

Parapatric Speciation

Science / Marine Biology / Parapatric Speciation: The differentiation into distinct species of populations experiencing some gene flow MORE

Paranomasia

Entertainment / Literature / Paranomasia: The technical Greek term for what English-speakers commonly refer to as a 'pun.' See extended discussion under pun, below. MORE

Paranoid Type Schizophrenia

Science / Psychiatry / Paranoid Type Schizophrenia: Presence of prominent delusions and auditory hallucinations in an individual, where disorganized speech, disorganized behavior, or flat/inappropriate affect may not be prominent. MORE

Paranoid Ideation

Science / Psychiatry / Paranoid Ideation: Ideation, of less than delusional proportions, involving suspiciousness or the belief that one is being harassed, persecuted, or unfairly treated. MORE

Parapet

Business / Construction / Parapet: A wall placed at the edge of a roof to prevent people from falling off. MORE