deletion

1. The act of deleting; removal by striking out.
2. Material, such as a word or passage, that has been removed from a body of written or printed matter.
3. Genetics. The loss, as through mutation, of one or more nucleotides from a chromosome.

noun

The act of erasing or the condition of being erased: cancellation, erasure, expunction, obliteration. See include/exclude.

A change order that reduces the scope of work originally defined in the contract documents.

In genetics, loss of genetic material from a chromosome.