1. Parts per million; pages per minute

Encyclopedia: Ppm

• phonation
• phone
• phone bill
• phone booth
• phone box
• phone call
• phone card
• phone company
• phone cord
• phone jack
• phone line
• phone message
• phone number
• phone plug
• phone service
• phone system
• phone tapper
• phone-in
• phonebook
• phoneme
• phonemic
• phonemic system
• phonemics
• phoner
• phonetic