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A single raise is a raise of a level. Typically this term is used after a one-level suit opening. (e.g. 1-2 is a single raise) It's natural meaning is a minimum supporting hand (6 to 9 points) with an 8-card fit. (may be longer unless Bergen raises are used)

Raises

Single raise - Jump raise
Competitive raise - Preemptive raise - Constructive raise - Limit raise - Forcing raise
Inverted minor raise - Bergen raise - Splinter - Jacoby 2NT - Truscott 2NT (Jordan 2NT)
Quantitative slam invite