ACE

Access Control Encryption-Entry, Adobe Certified Expert, Advanced Computing Environment, ursprung SCO, Adverse Channel Enhancements, ursprung Microcom, Automatic Computing Engine

a serve that the receiver is unable to reach

one of four playing cards in a deck having a single pip on its face

someone who is very highly skilled

play in one stroke; of holes, in golf

serve and ace against

(informal) of the highest quality