a switch that is used to select among alternatives
"The selector on the radio allowed me to choose between different stations."
Someone or something which selects or chooses.
"The new software selector allows users to easily filter their favorite files from a long list."
In plain English: A selector is something that picks out specific items from a larger group to choose for use.
"The selector on the radio was stuck, so I couldn't find any clear stations."
Usage: A selector refers to either a person who makes choices, such as an election official, or a physical device like a switch used to select settings on machinery. Use this term when describing the agent of selection rather than simply stating that someone "chose" something.
Selector is formed by adding the suffix -or to the word select. This construction creates an agent noun meaning one who or that which selects.