Foundation. / The bottom; the buttocks or anus. / The underlying basis or principle for a theoretical or mathematical system.

Synonym of base unit (“unit of measurement”).

plural of fundamental interaction

plural of fundamental particle

plural of fundamental constant

(chiefly mathematics) A theorem (or, in non-mathematical fields, a commonly accepted hypothesis) considered to be of central importance to a specified field.

plural of fundamental theorem

plural of fundamental force

plural of fundamental group

(art) An approach to painting that focuses on the physical brushwork, textures, etc.