Coinstantaneity is a word that means happening at the same time. There are several synonyms that can be used to replace the word coinstantaneity. One of these synonyms is simultaneity. This word is often used to describe events or actions that happen at the same time. Another synonym is synchronicity, which is often used to describe events that are connected in some way, or that seem to occur at the same time for a reason. Additionally, co-occurrence is another synonym for coinstantaneity. This word is often used to describe events or situations that happen together, but are not necessarily connected in any other way. There are many other synonyms for the word coinstantaneity, each of which can be used in different contexts to describe the same type of event.