One who is not a radical.
That which is not a radical (group of atoms that function as a unit in reactions).
Not radical.
A person who arbitrates between contending parties.
One of the two white-coated officials who preside over a cricket match.
The official who presides over a tennis match sat on a high chair.
One of the officials who preside over a baseball game.
A match official on the ground deciding and enforcing the rules during play. As of 2007 the Australian Football League uses three; in the past there were two or just one. The other officials, the goal umpires and boundary umpires, are usually referred to by those phrases.
The official who stands behind the line on the defensive side or next to the referee on the offensive side.
The official who presides over a curling game.
To act as an umpire in a game.
To decide as an umpire.