1. (mathematics and logic) if and only if

Encyclopedia: Iff

• persuadable
• persuade
• persuader
• persuasible
• persuasion
• persuasive
• persuasively
• persuasiveness
• pert
• pertain
• pertainym
• Perth
• pertinacious
• pertinaciously
• pertinaciousness
• pertinacity
• pertinence
• pertinency
• pertinent
• pertinently
• pertly
• pertness
• perturb
• strong-growing
• strong-minded