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Definition of essentiality : The quality of being essential; the essential part.

Synonyms:

substance, nature, surface, texture, essence, quintessence, being, essentialness

goodness, whiteness, probity, honorableness, sinlessness, decency, aboriginality, immaculateness, elementariness, angelicness, innocence, chastity, faultlessness, blamelessness, simplicity, spotlessness, virtuousness, cleanness, purity, guiltlessness, fundamentality

Usage examples:

• The continuing need of all free nations today is for each to recognize clearly the essentiality of an unbreakable bond among themselves based upon a complete dedication to the principles of collective security, effective cooperation and peace with justice. - "Complete State of the Union Addresses from 1790 to the Present", Various.
• In modern times the salvation of the virtuous in tragedy has had warm defenders, including Racine and Dr. Johnson; and the essentiality of either an unhappy ending or of deaths has been generally denied. - "Tragedy", Ashley H. Thorndike.