belonging

Etymology 1

From belong + -ing.

noun

1. (uncountable) The feeling that one belongs.
   I have a feeling of belonging in London.
   A need for belonging seems fundamental to humans.
2. (countable, chiefly in the plural) Something physical that is owned.
   Make sure you take all your belongings when you leave.
   Now, upstairs, she changed into faded Levis and a green sweater, and fastened round her wrist her third most valued belonging, a gold watch […] 1966, Truman Capote, In Cold Blood, New York: Modern Library, published 1992, Part I, p. 22
3. (plural only, colloquial, dated) Family; relations; household.

Etymology 2

From Middle English belonginge, belanging, belangand, equivalent to belong + -ing.

verb

1. present participle and gerund of belong