agamy
/ˈaɡəmi/noun
Absence of marriage; the state or condition of being unmarried. Also: lack of acknowledgement of, or opposition to, the institution of marriage.
Origin
Late 17th century; earliest use found in Edward Phillips (b. 1630), writer and biographer. From Hellenistic Greek ἀγαμία celibacy from ancient Greek ἄγαμος unmarried + -ία; compare -gamy.