substitution

British  

/ ˌsʌbstɪˈtjuːʃən /

noun

1. the act of substituting or state of being substituted

2. something or someone substituted

3. maths the replacement of a term of an equation by another that is known to have the same value in order to simplify the equation

4. maths logic

   1. the uniform replacement of one expression by another

   2. an expression so derived from another

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Example Sentences

Recessions are generally characterized, in the first instance, by the substitution of a sudden, sharp, upward movement in the unemployment rate for a gradual downward or sideways movement.

From Barron's • Apr. 3, 2026

The bank expects resilient demand and cash flow across the sector, supported by stimulus safeguarding local supply chains and acceleration of import substitution, to partially offset prolonged volatility risks.

From The Wall Street Journal • Mar. 25, 2026

It also can measure the limits of releases from strategic petroleum reserves, spare production capacity, freight constraints and refinery substitution, he said.

From MarketWatch • Mar. 24, 2026

Phil Foden's stoppage-time appearance in Manchester City's Carabao Cup final victory over Arsenal felt like a "charity" substitution, says former England captain Wayne Rooney.

From BBC • Mar. 23, 2026

They were both fans of the monoalphabetic substitution cipher.”

From "Book Scavenger" by Jennifer Chambliss Bertman