1. (n.) The reception of one part within another.

2. (n.) The abnormal reception or slipping of a part of a tube, by inversion and descent, within a contiguous part of it; specifically, the reception or slipping of the upper part of the small intestine into the lower; introsusception; invagination.

3. (n.) The interposition of new particles of formative material among those already existing, as in a cell wall, or in a starch grain.

4. (n.) The act of taking foreign matter, as food, into a living body; the process of nutrition, by which dead matter is absorbed by the living organism, and ultimately converted into the organized substance of its various tissues and organs.

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