(senseid)The inherent nature of a thing or idea.
- The laws are at present, both in form and essence , the greatest curse that society labours under.
- Gifts and alms are the expressions, not the essence of this virtue [charity].
(philosophy) The true nature of anything, not accidental or illusory.
- The essence of Addison's humour is irony.
A being; especially, a purely spiritual being.
- Uncompounded is their essence pure.
* Washington Irving
- As far as gods and heavenly essences / Can perish.
A significant feature of something.
The concentrated form of a plant or drug obtained through a distillation process.
* essence of Jojoba
Fragrance, a perfume.
* Alexander Pope
- He had been indulging in fanciful speculations on spiritual essences , until he had an ideal world of his own around him.
- Nor let the essences exhale.
* in essence
* of the essence; time is of the essence
A necessity or prerequisite; something required or obligatory.
(engineering) A statement (in domain specific terms) which specifies a verifiable constraint on an implementation that it shall undeniably meet or (a)'' be deemed unacceptable, or ''(b)'' result in implementation failure, or ''(c) result in system failure.
* Adjectives often used with "requirement": stringent, complex, reasonable, mandatory, important, financial, medical, educational, physical, chemical
* Verbs often used with "requirement": meet, comply with, satisfy, fulfill, impose, waive, abolish, drop, add, remove, fail to meet, ignore, understand, state, specify, increase, reduce, change, modify
* (prerequisite) condition, prerequisite, necessity
* functional requirement
* requirements engineering
* requirements analysis