Big inits. in check processing

• Payroll services company
• Big check-printing co.
• Big name in payroll
• Payroll service co
• Data processing by a computer
• Big payroll service co.
• An ester of adenosine that is converted to ATP for energy storage

Wikipedia Word definitions in Wikipedia
Adp or ADP may refer to:

Wiktionary Word definitions in Wiktionary
n. (initialism of adenosine diphosphate English)