Where does “ace” come from?

I appreciate the detailed instructions, but I notice a significant problem: the etymology chain provided doesn't actually connect to the headword "ace." The chain traces: asexual → a- → a → and → ad- → ad → h₂epo → h₂epo This chain explains the prefix "a-" (meaning "not" or "without"), not the word "ace" itself. "Ace" has a different etymology entirely (from Old French *as, from Latin as, a unit). I cannot write an accurate one-sentence origin summary because the chain you've provided doesn't support the headword. Per your instruction to "state only what the chain supports" and "do not invent," I must flag this disconnect rather than create a false etymology. Could you verify either: 1. The headword should be "a-" or "asexual" rather than "ace"? 2. The etymology

ace (English): A single point or spot on a playing card or die;...