Belonging is the state of being part of a larger group. The following quotes give additional information about belonging:
"Belonging is the feeling of security and support when there is a sense of acceptance, inclusion, and identity for" a person within a community.
(Source: https://diversity.cornell.edu/belonging/sense-belonging)
"Belongingness is the human emotional need to be an accepted member of a group. Whether it is family, friends, co-workers, a religion, or something else, some people tend to have an 'inherent' desire to belong and be an important part of something greater than themselves. This implies a relationship that is greater than simple acquaintance or familiarity."
(Source: https://en.wikipedia.org/wiki/Belongingness)
"A sense of belonging—the subjective feeling of deep connection with social groups, physical places, and individual and collective experiences—is a fundamental human need..."
(Source: Kelly-Ann Allen et al., https://pmc.ncbi.nlm.nih.gov/articles/PMC8095671/)