in theory

phrase

1

—used to say what should happen or be true if a theory is correct

In theory, the reading skills of the students should improve.

2

—used to say that something seems to be true or possible as an idea but may not actually be true or possible

I agree with you in theory, but realistically I don't think we have the time to do that.

Examples of in theory in a Sentence

Recent Examples on the Web

This list rounds up the very fastest cars that can, in theory, be purchased today (which is why some familiar names like Koenigsegg, whose vehicles are currently all sold out, are not included). — Bryan Hood, Robb Report, 4 Nov. 2026

Solanezumab was, as Richard acknowledged, not the most effective at removing amyloid; in theory, a more potent amyloid-clearer might have fared differently. — Manvir Singh, New Yorker, 2 Nov. 2026

Many hydroxyapatite products use a form called nano-hydroxyapatite, which has smaller particles that, in theory, can more easily penetrate pores in enamel, though research data is limited. — Rachel Carlson, NPR, 2 Nov. 2026

Beijing could, in theory, offer sovereign guarantees to offset firms’ insurance premiums. — Joel Wuthnow, Foreign Affairs, 2 Nov. 2026

Rhymes for in theory

• kashmiri
• beery
• bleary
• cheery
• cirri
• dearie
• deary
• dreary
• eerie
• kiri
• leary
• leery