noun which may take the genitive case particle 'no', noun
Linguistics term referring to the default, neutral, or unmarked member of an opposition (e.g., the unmarked form in a grammatical contrast). Often contrasted with 有標 (marked).
See also: 有標
In linguistics, 'dog' is considered unmarked while 'bitch' is marked.
In this opposition, the unmarked form has a broader meaning.