In writing a paper in a Microsoft Word Document I wrote "omittance," which prompted an edit remark from the program telling me that I spelled the word incorrectly. I don't know why I felt like writing omittance when I know that the proper word is omission, but there it was on the page. And honestly the word looked like it should be a word considering I wanted to use omission in a future tense. In Google searching I found the use of omittance in the unabridged Merriam Webster dictionary; however I hesitate to accept anything from them. So I ask the experts here, is omittance ever an acceptable tense of omission or should I omit its use forevermore?
There's no such word as 'omittance'. Omit should be more than adequate.
-ance describes a quality or state or an instance of one: arrogance, relevance. or it can be used to describe an action. By its very definition an omission has no quality or state. Why are you trying to define the quality or state of an omission?