Adjective

(en adjective)

Spontaneous, without requiring conscious thought.

* {{quote-magazine, date=2012-01

, author=Steven Sloman , title=The Battle Between Intuition and Deliberation , volume=100, issue=1, page=74 , magazine= citation , passage=Libertarian paternalism is the view that, because the way options are presented to citizens affects what they choose, society should present options in a way that “nudges” our intuitive selves to make choices that are more consistent with what our more deliberative selves would have chosen if they were in control.}}

* 2013 February 16, Laurie Goodstein, “ Cardinals Size Up Potential Candidates for New Pope”, NYTimes.com :

These impressions [of potential papal candidates], collected from interviews with a variety of church officials and experts, may influence the very intuitive , often unpredictable process the cardinals will use to decide who should lead the world’s largest church.

The intuitive response turned out to be correct.

Easily understood or grasped by intuition.

Designing software with an intuitive interface can be difficult.

Having a marked degree of intuition.

Adjective

(en adjective)

Necessary.

Very important; of high importance.

* {{quote-magazine, date=2013-05-17

, author=George Monbiot, authorlink=George Monbiot , title=Money just makes the rich suffer , volume=188, issue=23, page=19 , magazine=(The Guardian Weekly) citation , passage=In order to grant the rich these pleasures, the social contract is reconfigured. The welfare state is dismantled. Essential public services are cut so that the rich may pay less tax. […]}}

Being in the basic form; showing its essence.

Don’t mind him being grumpy. That’s the essential Fred.

Really existing; existent.

* Webster (1623)

Is it true, that thou art but a name, / And no essential thing?

Such that each complementary region is irreducible, the boundary of each complementary region is incompressible by disks and monogons in the complementary region, and no leaf is a sphere or a torus bounding a solid torus in the manifold.

(medicine) Idiopathic.