Modal (adjective)

1. Relating to or expressing a mode or manner of being or doing.
2. Expressing possibility, necessity, or permission.

Origin:

From the late 15th century word modal, which comes from the latin word modalis, which means relating to mode or manner.

Examples:

1. The modal verbs in English include can, could, may, might, must, shall, should, will, and would.
2. The modal fabric is a blend of cotton, polyester, and spandex.
3. Modal logic is a type of formal logic that deals with the concepts of necessity and possibility.
4. The modal analysis is a method used to determine the dynamic characteristics of a structure.
5. The modal window is a dialog box that is displayed on top of the current page.