A hole in one.
The ball marked with the number 1 in pool and related games.
An expert at something; a maverick, genius; a person owning a "first rank" talent.
A perfect score on a school exam.
A dollar bill.
A person who is asexual.
A military aircraft pilot who is credited with shooting down many enemy aircraft, typically five or more.
The best pitcher on the team.
Any of various hesperiid butterflies.
A card or die face so marked.
A single point or spot on a playing card or die normally indicating it as the prime, i.e. first and forefront. (in playing cards, of that series)
A point won by a single stroke, as in handball, rackets, etc.
A very small quantity or degree; a particle; an atom; a jot.
A serve won without the opponent hitting the ball.
To win a point by an ace.
To pass (a test, interviews etc.) perfectly.
To make an ace (hole in one).
Excellent.
Asexual, not experiencing sexual attraction.
One in a series of clues leading to a person or place.
A single link in a chain indicating the hierarchical location of a directory, web page or similar, used as a navigation aid.
A tiny piece of bread, either one that falls from bread as it is cut or eaten, or one made deliberately by crumbling bread.
To add navigational breadcrumbs to (a web page or user interface).
To use clues or enticements to lead someone in the desired direction.
To sprinkle breadcrumbs on to food, normally before cooking.