We found one dictionary that defines the word at the same instant:

Business (1 matching dictionary)

1. at the same instant: Legal dictionary

▸ Words similar to at the same instant ▸ Usage examples for at the same instant ▸ Idioms related to at the same instant ▸ Wikipedia articles (New!) ▸ Words that often appear near at the same instant ▸ Rhymes of at the same instant ▸ Invented words related to at the same instant