That is to say

adv

Definitions

Adverb
  1. 1
    In other words. Used to introduce a clarification, simplification, or explanation conjunctive, not-comparable

    "One of the best things about works of music is that they are repeatable, that is to say that one can listen to the same work over and over without becoming tired of it."

Adverb
  1. 1
    as follows wordnet

Etymology

Calque of French c'est-à-dire.

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