1.
same rank; equal status; equality
having the same rank, status, or standing
2.
apposition (grammar)
a grammatical construction where two noun phrases refer to the same entity
同格 has two main uses: (1) equal rank or status between people or things, and (2) a grammar term for apposition, where two noun phrases refer to the same entity.
SENSE 1 — EQUAL STATUS:
Describes people or things at the same level. Often used with と or に to indicate the standard of comparison.
SENSE 2 — GRAMMAR (APPOSITION):
In Japanese grammar, 同格 refers to appositional constructions like:
The particle の in these constructions is called 同格の「の」.