of essence (adjective) prerequisite: necessary
Detalii: a perquisite is a profit or benefit in addition to a salary or wages or a gratuity or tip for services performed, while a prerequisite is something that is required in advance
Sinonime: abandon, backstab, be disloyal, be unfaithful,
betray, break promise, commit treason, cross, deceive, double-cross, doublecross, finger*, go back on, inform on, play Judas, sell down the river, sell down the river, sell out, trick, turn in, turn informer, turn traitor
Antonime: optional,
unnecessary,
voluntary