In a synonymous way.

The quality of being synonymous.

(information science, metadata) Synonym of synset

(taxonomy) A synonym when the names being synonymized have the same type, making them objectively identical.

(taxonomy) A synonym when the names being synonymized have different types, based to some extent on the opinion of the writer.

(botany) A synonym that comes into being when a taxon is reduced in status ("reduced to synonymy") and becomes part of a different taxon. The zoological equivalent is "subjective synonym".

Synonym of near-synonym

(zoology) In zoological nomenclature, a name which describes the same taxon as one or more subsequently published names.

(zoology) In zoological nomenclature, a name which describes the same taxon as a previously published name.

(linguistics) A term whose meaning is similar, but not identical, to that of another term.