well-defined

specified nicely

In mathematics, the term well-defined is used to specify that a certain concept or object (a function, a property, a relation, etc.) is defined in a mathematical or logical way using a set of base axioms in an entirely unambiguous way and satisfies the properties it is required to satisfy. Usually definitions are stated unambiguously, and it is clear they satisfy the required properties. Sometimes however, it is economical to state a definition in terms of an arbitrary choice; one then has to check that the definition is independent of that choice. On other occasions, the required properties might not all be obvious; one then has to verify them. These issues commonly arise in the definition of functions.
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Adjective
1. having a clean and distinct outline as if precisely cut along the edges; "a finely chiseled nose"; "well-defined features"
(synonym) chiseled
(similar) distinct
2. accurately stated or described; "a set of well-defined values"
(synonym) clear
(antonym) ill-defined, unclear

Synonyms and related words:
clean-cut, clear, clear as crystal, clear as day, clear-cut, coherent, connected, consistent, conspicuous, crisp, crystal-clear, crystalline, defined, definite, direct, distinct, evident, explicit, express, glaring, in focus, limpid, loud and clear, lucid, luminous, obvious, patent, pellucid, perspicuous, plain, prominent, pronounced, simple, staring, straightforward, translucent, transparent, transpicuous, unambiguous, unconfused, unequivocal, univocal, unmistakable, well-marked, well-pronounced, well-resolved
  

well-defined
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