| nonstandard | (adjective) not standard; not accepted as a model of excellence | - |
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| (adjective) varying from or not adhering to a standard | - |
| (adjective) not conforming to the language usage of a prestige group within a community | - |
| standard | (adjective) established or well-known or widely recognized as a model of authority or excellence | - |
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| (adjective) conforming to or constituting a standard of measurement or value; or of the usual or regularized or accepted kind | - |
| (adjective) conforming to the established language usage of educated native speakers | Synonyms: received |
| (adjective) commonly used or supplied | - |
| (adjective) regularly and widely used or sold | Synonyms: stock |
| standardised | (adjective) capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability | Synonyms: exchangeable, interchangeable, similar, standardized |
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| (adjective) brought into conformity with a standard | Synonyms: standardized |
| standardized | (adjective) capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability | Synonyms: exchangeable, interchangeable, similar, standardised |
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| (adjective) brought into conformity with a standard | Synonyms: standardised |
| substandard | (adjective) falling short of some prescribed norm | Synonyms: deficient, inferior |
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