soltero m (feminine singular soltera, masculine plural solteros, feminine plural solteras)
soltero m (plural solteros, feminine soltera)
From Latin sōlitārius (“lonely”)[1]. Compare Portuguese solteiro, Catalan solter. See also the borrowed doublet solitario. Another theory, perhaps less likely, derives it from suelto, from Latin solutus (“unbound, released, free, at large”)[2].