Cotemporally is an uncommon word that means something is happening at the same time or in the same era. It can be useful in academic and professional writing, but if you are looking for synonyms for this word, there are several options you can use to convey a similar meaning. These include contemporaneously, concurrently, simultaneously, concomitantly, coincidentally, and coexisting. Each of these words has its own nuances and connotations, so it's important to choose the one that best fits the context of your writing. By using synonyms for cotemporally, you can add variety to your language and make your writing more engaging.