PMS

Noun

• Performance management system, performance measurement system or performance monitoring system [Note that these are NOT synonymous, but are used in the same field, so intended usage should be confirmed if important.]
• Premenstrual syndrome or premenstrual stress [often considered synonymous]
• Planned maintenance system
• Project management system
• Package management system.

Proper Noun

• Pantone Matching System, a proprietary set of color designations

Verb

• To experience premenstrual syndrome or premenstrual stress.