The Collaborative International Dictionary
Solidary
Solidary \Sol"i*da*ry\, a. Having community of interests and responsibilities.
Men are solidary, or copartners; and not isolated.
--M.
Arnold.
Douglas Harper's Etymology Dictionary
solidary
1818, from French solidaire (16c.), from solide (see solid (adj.)).
Wiktionary
solidary
a. Having community of interests and responsibilities.