Meaning of ESSENTIAL in English

ESSENTIAL

adj.

1) ~ for; to

2) ~ to + inf. (it is ~ to work hard)

3) ~ that + clause; subj. (it is ~ that all be present)

The Bbi combinatory dictionary of English, a guide to word combinations.      Комбинаторный словарь английского языка Bbi. Руководство по словосочетаниям.