that is

From Old English þæt is.

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that is (not comparable)

1. (conjunctive) In other words; that is to say. Used to introduce a clarification or explanation

   Synonyms: that is to say, i.e.; see also Thesaurus:in other words

   The Brazilian population is multiethnic—that is, it has many ethnicities.

   • 1981 December 27, Wade Nichols, “Victorian Imperialism”, in Gay Community News, volume 9, number 23, page 5:

     Some say history repeats itself, that time is cyclical. Others cling to the notion of progress and change over time. Apparently Nancy Walker marches to a different drummer — marches backwards, that is. Her ideas on art and society seem quaint and odd on the one hand and, on the other, petty and regressive.

• Hiatts, hattis, staith