| on | small and remote and insignificant |
|---|---|
| on | one part in a hundred |
| on | a one-line joke |
| on | designed for or restricted to a single person |
| on | a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) |
| on | based on the system of having only one member from each district (as of a legislature) |
| on | one part in a million |
| on | a performance in one place on one night only |
| on | a brief sexual encounter lasting only for a single night |
| on | a ninth part |
| on | (sports) being a system of play in which an individual defensive player guards an individual offensive player |
| on | directly between two individuals |