nitty-gritty

Synonyms:

center, centre, core, essence, gist, heart, heart and soul, inwardness, kernel, marrow, meat, nub, pith, substance, sum

Types:

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bare bones

(plural) the most basic facts or elements

hypostasis

(metaphysics) essential nature or underlying reality

haecceity, quiddity

the essence that makes something the kind of thing it is and makes it different from any other

quintessence

the purest and most concentrated essence of something

stuff

a critically important or characteristic component

Type of:

cognitive content, content, mental object

the sum or range of what has been perceived, discovered, or learned