The act of extending; a stretching out; enlargement in length, breadth, or time; an increase. • The state of being extended. • That property of a body by which it occupies a portion of space (or time, e.g. "spatiotemporal extension"). • A short exact sequence 1→H→E→G→1, or the group E therein. • A short exact sequence 0→B→E→A→0, or the object E therein. • A part of a building that has been added onto the original. • An outgrowth; a part of something that extends its capabilities. • Capacity of a concept or general term to include a greater or smaller number of objects; — correlative of intension. • Semantic widening, broadening of meaning. • A written engagement on the part of a creditor, allowing a debtor further time to pay a debt. • The operation of stretching a broken bone so as to bring the fragments into the same straight line. • An exercise in which an arm or leg is straightened against resistance. • A simple offensive action, consisting of extending the weapon arm forward. • A numerical code used to indicate a specific telephone in a telecommunication network. • Ellipsis of file extension. • An optional software component that adds functionality to an application. • The set of tuples of values that, used as arguments, satisfy the predicate. • A kind of derivative morpheme applied to verbs in Bantu languages. • The ideal in the codomain generated by the image of the given ideal under the given homomorphism. • University programs that are targeted at the broader (usually adults) community whose participants are not full-time enrolled students. • Clipping of hair extension, nail extension, or eyelash extension.