(computing, graphical user interface) Multiple selection; the ability to have more than one item selected at the same time. noun.

What is a multi select list?

A multiple-selection list box is list of choices that looks like a scrollable list of check boxes instead of a typical list box. Users can select as many check boxes as necessary from the list.

What is multi select field?

A metadata field of type multiSelect is displayed to a user as a dropdown list. The user can select multiple items from the list. A multiSelect field allows a user to select zero, 1, or more values.