synesis

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syn·e·sis

S0968000 (sĭn′ĭ-sĭs)n. A construction in which a form, such as a pronoun, differs in number but agrees in meaning with the word governing it, as in If the group becomes too large, we can split them in two.
[Greek sunesis, union, understanding, from sunīenai, to understand, bring together : sun-, syn- + hīenai, to send, hurl; see yē- in Indo-European roots.]

synesis

(ˈsɪnɪsɪs) n (Grammar) a grammatical construction in which the inflection or form of a word is conditioned by the meaning rather than the syntax, as for example the plural form have with the singular noun group in the sentence the group have already assembled[via New Latin from Greek sunesis union, from sunienai to bring together, from syn- + hienai to send]

syn•e•sis

(ˈsɪn ə sɪs)

n. a construction in which an expected grammatical agreement in form is replaced by an agreement in meaning, as in The crowd rose to their feet, where a plural pronoun is used to refer to a singular noun. [1890–95; < New Latin < Greek sýnesis understanding = syn(i)-é(nai) to bring together, perceive, understand (syn- syn- + hiénai to throw, send) + -sis -sis]

synesis

the practice of using a grammatical construction that conforms with meaning rather than with strict regard for syntax, such as a plural form of a verb following a singular subject that has a plural meaning.See also: Grammar