Conjugation comes from Latin coniugatio ('a combining, conjugation'), from coniugare ('to yoke together'), from con- ('together') + iugare ('to join'), from iugum ('yoke'). The historical trail runs through coniugatio in Latin, iugum in Latin, and *yewg- in Proto-Indo-European. Morphologically, conjugation is transparent: it draws on Latin coniugatio ('a combining, conjugation'), from coniugare ('to yoke together'), from con- ('together') + iugare ('to join'), from iugum ('yoke'). Used as a noun, conjugation now means "the set of inflected forms of a verb, or the act of forming them", so the present definition can be read against the older forms and meanings. The same lexical family is also visible in derived forms such as conjugational and related forms such as conjugate, conjugal, subjugate, and yoke. The result is a borrowed or transmitted form whose modern spelling carries a compact record of its route into English.