A serve that the receiver is unable to reach, as in tennis.

ETYM Old Eng. as, French as, from Latin as, assis, unity, copper coin, the unit of coinage. Related to As.
Someone who is very highly skilled; SYN. adept, virtuoso, genius, hotshot, star, whiz, whizz, wizard, wiz.

1. Automated Calibration Equipment
2. American Council on Education
3. Proteolytic enzyme that converts angiotensin I into angiotensin II
4. A major strategic headquarters of NATO; safeguards an area extending from Norway to Turkey

(Informal) Of the highest quality; SYN. A-one, crack, first-rate, super, tiptop, topnotch, tops.

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

Stands for access control entry, an entry in an access control list (ACL).
See: access control entry (ACE)

1. To play in one stroke; of holes, in golf.
2. To score a point against
3. To serve and ace against (someone), in tennis.