Etymology of belonging:
mid-14c., "to go along with, relate to," from be- intensive prefix, + O.E. langian "pertain to, to go along with." Sense of "to be the property of" first recorded late 14c. Related to M.Du. belanghen, Du. belangen, Ger. belangen. Replaced earlier O.E. gelang, with completive prefix ge-. (http://www.etymonline.com)
"goods, effects, possessions," 1817, from belong. (http://www.etymonline.com)
Description of belonging:
1)to be in the right or suitable place. 2) to feel happy or comfortable in a situation. (http://dictionary.cambridge.org)
Maslow's hierarchy of needs:
Maslow's hierarchy of needs is a theory of motivation, whereby people must meet certain biological and psychological needs before they can desire self-actualisation.
The level in the hierarchy at which a person is operating may change from time to time. For example, once having ascended to the level of esteem, a person may temporarily regress to the level of the need for belonging if he or she no longer feels loved and accepted by others. The lower level needs must still be met even when someone is functioning at one of the higher levels.
(Kirby, S. 2009. http://psychology.suite101.com/article.cfm/abraham_maslows_hierarchy_of_human_needs.)