Synonymy can be used to describe sentences with the same meaning, for example.
From the en.wikipedia.org
The objection to synonymy hinges upon the problem of collateral information.
From the en.wikipedia.org
However, synonymy, polysemy and word usage patterns problems usually arise.
From the en.wikipedia.org
Therein is the suggestion of reptilian synonymy blown suddenly asunder.
From the theatlantic.com
Instead, he asserted, what was more interesting to study was the synonymy between signs.
From the en.wikipedia.org
But does interchangeability hold as an explanation of cognitive synonymy?
From the en.wikipedia.org
The following have been proposed for synonymy with Sclerocactus but this is controversial.
From the en.wikipedia.org
Synonymy is the phenomenon where different words describe the same idea.
From the en.wikipedia.org
A second suggestion Quine considers is an explanation of synonymy in terms of interchangeability.
From the en.wikipedia.org
More examples
The semantic relation that holds between two words that can (in a given context) express the same meaning
Synonyms are different words with identical or very similar meanings. Words that are synonyms are said to be synonymous, and the state of being a synonym is called synonymy. The word comes from Ancient Greek syn ("with") and onoma ("name"). The words car and automobile are synonyms. ...
A section of a systematic presentation about an organism that lists all of the names that have been used for the organism including synonyms, new combinations, misidentifications, etc. In some cases this section may include only true synonyms.
Synonyms are different scientific names used for a single taxon. They might arise when someone mistakenly describes a species that has already been described, or when two described taxa are later found to be the same species.
In a metadata registry, one name may be designated as the "enterprise name," derived by describing the content of a metadata entity in a structured way, using a set of rules, i.e., by application of a formalized naming convention. Other names for the same data entity may occur in any context. ...
Distinguishing between the different shades of meaning that synonymous words have (e.g. extend, increase, expand).
The relationship between two expressions that have the same sense. Synonyms, therefore, are expressions which share a sense; perfect synonyms would share all their senses.