OXFORD DICTIONARY
belong, v.intr.
1 (foll. by to) a be the property of. b be rightly assigned to as a duty, right, part, member, characteristic, etc. c be a member of (a club, family, group, etc.).
2 have the right personal or social qualities to be a member of a particular group (he's nice but just doesn't belong); (foll. by in, under). a be rightly placed or classified. b fit a particular environment.
belongingness n.
ME f. intensive BE- + longen belong f. OE langian (gelang at hand)
THESAURUS
belong
accord, affect, agree, answer to, appertain, appertain to, apply to, be a member, be inscribed, be there, bear on, bear upon, become, befit,
belong to, carry a card, chime, concern, connect, correspond, correspond to, deal with, fit, fit in, go, harmonize, have connection with, have its place, have place, hold membership, indwell, inhere, interest, involve, liaise with, link with, match, pertain, pertain to, refer to, regard, relate to, respect, set, subscribe, suit, tally, tie in with, touch, touch upon, treat of, vest, vest in