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3. that is

that is

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that is (to say)

what I really mean is I should be at the airport by seven, that is, unless there's a lot of traffic.

that is

Also, that is to say. To explain more clearly, in other words, as in It's on the first floor, that is, at street level, or We're coming next month, that is to say, in November. [Early 1600s] Also see under that's.

that is

To explain more clearly; in other words: on the first floor, that is, the floor at street level.