null form - определение. Что такое null form
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Что (кто) такое null form - определение

MORPHEME WHOSE REALIZATION IS NOT REFLECTED IN PRONUNCIATION OR ORTHOGRAPHY; USUALLY MARKED AS "∅" IN MORPHEMIC ANALYSES
Zero morpheme; Zero-form morpheme; Zero morph; Zero suffix

Nullform         
Null form; Null-form
In mathematics, a nullform of a vector space acted on linearly by a group is a vector on which all invariants of the group vanish. Nullforms were introduced by .
Null morpheme         
In morphology, a null morpheme or zero morpheme is a morpheme that has no phonetic form. In simpler terms, a null morpheme is an "invisible" affix.
Null allele         
NONFUNCTIONAL ALLELE (A VARIANT OF A GENE) CAUSED BY A GENETIC MUTATION
Null mutation; Null Allele; Null alleles; Null mutant
A null allele is a nonfunctional allele (a variant of a gene) caused by a genetic mutation. Such mutations can cause a complete lack of production of the associated gene product or a product that does not function properly; in either case, the allele may be considered nonfunctional.

Википедия

Null morpheme

In morphology, a null morpheme or zero morpheme is a morpheme that has no phonetic form. In simpler terms, a null morpheme is an "invisible" affix. It is a concept useful for analysis, by contrasting null morphemes with alternatives that do have some phonetic realization. The null morpheme is represented as either the figure zero (0) or the empty set symbol ∅.

In most languages, it is the affixes that are realized as null morphemes, indicating that the derived form does not differ from the stem. For example, plural form sheep can be analyzed as combination of sheep with added null affix for the plural. The process of adding a null affix is called null affixation, null derivation or zero derivation. The concept was first used by the 4th century BCE Sanskrit grammarian from ancient India, Pāṇini, in his Sanskrit grammar.