verb (used without object), veg·e·tat·ed, veg·e·tat·ing.
1.
to grow in, or as in, the manner of a plant.
2.
to be passive or unthinking; to do nothing: to lie on the beach and vegetate.
3.
Pathology. to grow, or increase by growth, as an excrescence.
Origin: 1595–1605; < Latinvegetātus (past participle of vegetāre to quicken, enliven), equivalent to veget(us) lively (orig. past participle of vegēre to give vigor) + -ātus-ate1
1605, "to grow as plants do," perhaps a back-formation from vegetation, or from L. vegetatus, pp. of vegetare "to enliven, to animate" (see vegetable). Sense of "to lead a dull, empty, or stagnant life" is from 1740.