资料来源 : pyDict

本性,真髓,本质

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Essentiality \Es*sen`ti*al"i*ty\, n.
   The quality of being essential; the essential part. --Jer.
   Taylor.

资料来源 : WordNet®

essentiality
     n : basic importance [syn: {essentialness}] [ant: {inessentiality}]