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that is ['ðætɪz]
social.sc.	id est
that is to say ['ðætɪz]
gen.	id est
English thesaurus
that is ['ðætɪz]
gen.	in other words (on the first floor, that is, the floor at street level); to be precise; to be specific; for example; to be more accurate; used to introduce or follow a clarification, interpretation, or correction of something already said (He was a long-haired kid with freckles. Last time I saw him, that is. lexico.com)
abbr.	i.e.