In the manner or style of a commentator; in a way involving explanation or interpretation of events.
From 'commentatorial' (relating to commentators) plus the adverb suffix '-ly'. This adverb allows describing actions done in a commentator-like fashion.
When a political analyst speaks 'commentatorially' on TV, they're literally changing how you understand the news—their tone, emphasis, and word choice insert interpretation into supposedly objective reporting, which is why media literacy includes understanding this voice!
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