Meaning

adjective of or relating to marriage or to the relationship between a wife and husband

adverb in a conjugal manner

origin1650s, from Latin connūbiālis, from connūbium (“marriage, wedlock”) (variants of cōnūbiālis (“pertaining to wedlock”), from cōnūbium (“marriage, wedlock”)) from com- (“together”) (English com-) + nūbō (“marry, to take as husband”) (from which nubile) from Proto-Indo-European *snewbʰ- (“to marry, to wed”).

Etymology from Wiktionary, CC BY-SA 3.0