Semantic feature
Encyclopedia
A semantic feature is a notational method which can be used to express the existence or non-existence of pre-established semantic properties
Semantic property
Semantic properties or meaning properties are those aspects of a linguistic unit, such as a morpheme, word, or sentence, that contribute to the meaning of that unit...

 by using plus and minus signs.

Man is [+HUMAN], [+MALE], [+ADULT]

Woman is [+HUMAN], [-MALE], [+ADULT]

Boy is [+HUMAN], [+MALE], [-ADULT]

Girl is [+HUMAN], [-MALE], [-ADULT]

Intersecting semantic class
Semantic class
A semantic class contains words that share a semantic property. Semantic classes may intersect. The intersection of female and young can be girl.See also: Semantic feature, Categorization, semantic field...

es share the same features.

Some features need not be specifically mentioned as their presence or absence is obvious from another feature. This is a redundancy
Redundancy (language)
In linguistics, redundancy is the construction of a phrase that presents some idea using more information, often via multiple means, than is necessary for one to be able understand the idea....

rule.
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