inversion n. 1. in Piagetian theory, see negati...
abstinence rule see rule of abstinence.
illuminism n. an exalted hallucinatory state in which the p...
LD 1. abbreviation for learning disability. 2. abbreviation...
f in mathematics, symbol for function. f...
acuity n. sharpness of perception. Whereas visual acuity is...