Any strictly defined separation.
A limit thus fixed, in full demarcation line.
The act of marking off a boundary or setting a limit, notably by belligerents signing a treaty or ceasefire.
The act of treating one thing as distinct from another, or of creating such a distinction; of separating a class of things into categories; of describing a thing by illustrating how it is different from something else.
The process of separation of cooling magma into various rock types.
The process of applying the derivative operator to a function; of calculating a function's derivative.
The evolutionary process by which one taxonomic group (species, genus, variety, etc.) becomes distinct from another, or acquires distinct features; the result of such a process: distinctness.
The process of developing distinct components.
The process by which the components of multicellular life (cells, organs, etc.) are produced and acquire function, as when a seed develops the root and stem, and the initial stem develops the leaf, branches, and flower buds.