What are the opposite words for ex-tensions?

Extensions are additional lengths or dimensions that are added to the original form of something. The natural antonym for the word "extensions" is "reduction" or "decrease", where objects or qualities are diminished or made shorter. Another antonym for "extensions" could be "shortening", where something is reduced in length or size. Additionally, "contraction" is a relevant antonym that denotes the process of shrinking or reducing in size. Opposite terms to "extensions" may also include "curtailment," "limitation," or "restriction", all of which describe limiting, lowering, or minimizing factors. These antonyms provide a range of options for expressing the opposite of the concept of extensions.