Imperative (Synonyms (neccesary, urgent, critical, insistent, important),…
Water is imperative for survival.
It is imperative to avoid things your allergic to.
It is imperative to understand the rules in a fire drill.
vital importance; crucial
My soccer practice is not imperative.
The Nazis thought videotaping everything was imperative.
pg.30 "There was a tumult. It was imperative to stay together" -Night