extension

1. (mathematics, group theory, of a group G by a group H) A short exact sequence 1→H→E→G→1, or the group E therein.countableuncountable

2. (mathematics, homological algebra, of an object A by an object B in an abelian category) A short exact sequence 0→B→E→A→0, or the object E therein.countableuncountable

3. (semantics) Capacity of a concept or general term to include a greater or smaller number of objects; — correlative of intension.Examples: "Perversely, we love John Wick himself. That lethal, bereaved assassin is a good bad guy for our times, the natural extension of Tony Soprano, Walter White and all the other heroic antiheroes the culture has embraced."; "In addition to concepts and conceptual senses, Frege holds that there are extensions of concepts. Frege calls an extension of a concept a ‘course of values’. A course of values is determined by the value that the concept has for each of its arguments. Thus, the course of values for the concept __ is a dog records that its value for the argument Zermela is the True and for Socrates is the False, and so on. If two concepts have the same values for every argument, then their courses of values are the same. Thus, courses of values are extensional."countableuncountable

4. (linguistics, semantics) semantic widening, broadening of meaningcountableuncountable

5. (banking, finance) A written engagement on the part of a creditor, allowing a debtor further time to pay a debt.countableuncountable

6. (medicine) The operation of stretching a broken bone so as to bring the fragments into the same straight line.countableuncountable