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"that is," vs "that is to say,"

Both "that is" and "that is to say" are correct and commonly used in English. They are interchangeable and serve the same purpose of introducing further clarification or explanation.

Last Updated: March 25, 2024

that is,

This phrase is correct and commonly used in English to introduce further clarification or explanation.

This phrase is used to introduce an explanation or clarification of a previous statement.

Examples:

  • I enjoy outdoor activities, that is, hiking, biking, and camping.
  • She excels in various subjects, that is, math, science, and history.
  • The company offers a range of services, that is, consulting, training, and development.
  • He has many hobbies, that is, painting, playing the guitar, and cooking.
  • The event will include various activities, that is, games, music, and food.

Alternatives:

  • namely,
  • in other words,
  • to clarify,
  • specifically,
  • to put it differently,

that is to say,

This phrase is correct and commonly used in English to introduce further clarification or explanation.

This phrase is used to introduce an explanation or clarification of a previous statement.

Examples:

  • She excels in various subjects, that is to say, math, science, and history.
  • The company offers a range of services, that is to say, consulting, training, and development.
  • He has many hobbies, that is to say, painting, playing the guitar, and cooking.
  • The event will include various activities, that is to say, games, music, and food.
  • I enjoy outdoor activities, that is to say, hiking, biking, and camping.

Alternatives:

  • namely,
  • in other words,
  • to clarify,
  • specifically,
  • to put it differently,

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