noun: a word that has the same meaning as another word. For example “scared” is a synonym for “afraid.”
noun: two words that can be interchanged in a context are said to be synonymous relative to that context

What is a SYNONYM? When words divide synonyms unite. Words divide like a river but synonyms, as bridges, join opposite banks. Choosing words is like choosing one bank of a river over the other which includes one bank but excludes the other. Choose synonyms, the bridge, then have both sides.

See Also

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acoustics
atomic mass
centroid
Compendium and Definitions
energy density
List of Synonyms for Polarity or Duality
List of Synonyms for Scalar
Meaning
Son
Synonym Dictionary
8.21 - Signature same as Chord
9.10 - Love Connects All That Is