- that is
- phrasal
or that is to say
: the following or immediately preceding word or word group may express the intended meaning more understandably or more accurately than a previous word or word group — used to introduce or accompany an explanation or correction
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that is (or that is to say)a formula introducing or following an explanation or further clarification of a preceding word or wordsandrocentric-that is to say, male-dominated-concepts | He was a long-haired kid with freckles. Last time I saw him, that is
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that is (or that is to say)1— used when giving more accurate or specific information about someone or something that was just mentionedWe–that is to say my wife and I–will be attending the wedding.
2— used when giving information that affects something previously mentionedWe plan on going to the concert–that is, if tickets are still available.
• • •Main Entry: ↑that* * *
used to say what sth means or to give more information•
He's a local government administrator, that is to say a civil servant.
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You'll find her very helpful— if she's not too busy, that is.
Useful english dictionary. 2012.