Definitions from Wiktionary ( )

▸ adjective:  Real, actual, tangible.
▸ adjective:  (category theory, of a category) Analogous to the categories of algebraic objects which category theory was created to generalize, in the sense of having objects which can be thought of as sets equipped with some additional structure. Formally, equipped with a faithful functor to the category of sets.
▸ adjective:  (by extension, topos theory, of a category C with respect to another category X) Equipped with a faithful functor to X (called a base category), in which case C is called a concrete category over X.
▸ adjective:  Being or applying to actual things, rather than abstract qualities or categories.
▸ adjective:  Particular, specific, rather than general.
▸ adjective:  (not comparable) Made of concrete (building material).
▸ adjective:  (obsolete) Made up of separate parts; composite.
▸ adjective:  (obsolete) Not liquid or fluid; solid.
▸ noun:  (countable, uncountable) A building material created by mixing cement, water, and aggregate such as gravel and sand.
▸ noun:  (logic) A term designating both a quality and the subject in which it exists; a concrete term.
▸ noun:  (US) A dessert of frozen custard with various toppings.
▸ noun:  (perfumery) An extract of herbal materials that has a semi-solid consistency, especially when such materials are partly aromatic.
▸ noun:  (possibly obsolete) Sugar boiled down from cane juice to a solid mass.
▸ noun:  (obsolete) Any solid mass formed by the coalescence of separate particle; a compound substance, a concretion.
▸ verb:  (usually transitive) To cover with or encase in concrete (building material).
▸ verb:  (usually transitive) To solidify: to change from being abstract to being concrete (actual, real).
▸ verb:  (intransitive, archaic) To unite or coalesce into a solid mass.

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