I. noun
: a rapid learning process that takes place early in the life of a social animal (as a greylag goose) and establishes a behavior pattern involving recognition of and attraction to identifiable attributes of its own kind or of a substitute
II. noun
: genetic alteration of a gene or its expression that is inferred to take place from the observation that certain genes are expressed differently depending on whether they are inherited from the paternal or maternal parent — called also genomic imprinting