that is
EN- Adverb
- (conjunctive) In other words; that is to say. Used to introduce a clarification or explanation.
- (conjunctive) In other words; that is to say. Used to introduce a clarification or explanation.
- More Examples
- Used in the Middle of Sentence
- "The message is now the medium – that is powerful and means products can take off practically all by themselves."
- It actually starts as two beers, Mr. Adrià said: a straightforward lager and a German-style weissbier that is seasoned with orange peel, coriander and licorice.
- Or to put it in the bracingly original terms of “The Second Plane,” it is misology that is the cause of thanatism.
- Used in the Beginning of Sentence
- That is the slough of a rattler; we must be careful.
- That is so. You are responsible for this, is that not so?
- That is a serious accusation, so make sure you have plenty of evidence before you point the finger at someone.
- Used in the Middle of Sentence
Definition of that is in English Dictionary
- Part-of-Speech Hierarchy
- Adverbs
- Conjunctive adverbs
- Uncomparable adverbs
- Conjunctive adverbs
- Adverbs
Source: Wiktionary
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Grammatically, this idiom "that is" is an adverb, more specifically, a conjunctive adverb and an uncomparable adverb.