reg
n. countable B2 Upper Intermediate US //ˈɹɛɡ// reg
n. a short way of saying 'regulation' or 'registration'. You use this in casual talk or when writing notes to save space.
n. a clipped form of 'regulation' or 'registration'. Informal in register; frequently used in administrative, technical, or bureaucratic contexts to denote official rules or identification numbers.
You need to check the new safety regs.
The mechanic asked for the car's reg number before he could order the replacement parts.
While the official handbook is hundreds of pages long, most staff members only bother to learn the specific health and safety regs that apply to their daily tasks.
Shortening.
Usage
Commonly used in the plural ('regs') when referring to rules, and in the singular ('reg') when referring to a vehicle registration.