1. (n.) The condition of an invaginated organ or part.

2. (n.) One of the methods by which the various germinal layers of the ovum are differentiated.

aloofness ambiversion backwardness bashfulness blankness chilliness coldness complexion constraint coolness cycloid personality cyclothymia depth detachment discreetness discretion distance ectomorphism ectomorphy ectropion endomorphism endomorphy eversion expressionlessness extroversion extrovertedness frigidity frostiness guardedness humor iciness impassiveness impassivity impersonality inaccessibility ingoingness innerness inness interiority internality internalization intrinsicality introvertedness intussusception invagination inversion inwardness mesomorphism mesomorphy modesty other-directedness outgoingness personality tendency pronation remoteness repression reserve reservedness restraint resupination reticence reticency retirement retroflexion retroversion reversal reversing reversion revulsion schizoid personality schizothymia somatotype standoffishness subduedness supination suppression syntony topsy-turviness topsy-turvydom transposal transposition turning back turning backwards turning inside out turning inward turning over unaffability unapproachability uncongeniality undemonstrativeness unexpansiveness withdrawal withdrawnness