Restatement (That Is To Say)
2 related grammar points that express the same core idea - compared below so you can tell which one to reach for.
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つまり / すなわち
Restating a term precisely in legal, academic or technical writing.
A すなわち B。 vs ～つまり: Use すなわち. It asserts strict equivalence between the two expressions, which is why definitions use it. つまり summarises loosely ('so, basically'), and in a definition that looseness is exactly what you do not want.