something that is very awesome and worth getting very excited about. sounds very un-ace when said by americans.
by holyroman April 18, 2005

One who is on the broader autistic spectrum, including but not limited to those with autism, Asperger's, hyperlexia, and pervasive developmental disorder not otherwise specified. This definition is sometimes extended to include those with AD(H)D.
The group was open to all ACs, whether professionally or self diagnosed with anything from classic autism to PDD-NOS.
by InvisibleK October 29, 2005


Abbreviation for "ass crack"
by sexual harrisment October 30, 2007

A starting pitcher with stuff that is so dominant that even when he is not at his best he still has the ability to shut down a team and does shut down teams on a consistent basis.
Not Mark Buehrle.
Not Mark Buehrle.
Mark Buehrle is not an ace.
by Kalapse May 25, 2006

by mkreilein February 18, 2005
