extension

1. The act of extending; a stretching out; enlargement in length, breadth, or time; an increase. (countable, uncountable) · Next month the house is undergoing an extension.· Due to the unforeseen circumstances, you are allowed an extension of two weeks to complete the task.
2. The state of being extended. (countable, uncountable)
3. That property of a body by which it occupies a portion of space (or time, e.g. "spatiotemporal extension"). (countable, uncountable)
4. A short exact sequence 1→H→E→G→1, or the group E therein. (countable, uncountable)
5. A short exact sequence 0→B→E→A→0, or the object E therein. (countable, uncountable)
6. A part of a building that has been added onto the original. (countable, uncountable)
7. An outgrowth; a part of something that extends its capabilities. (countable, uncountable) · Parents who treat their children as an extension of themselves· My research is an extension of the work of my mentor.
8. Capacity of a concept or general term to include a greater or smaller number of objects; — correlative of intension. (countable, uncountable)

Plural extensions