Simultaneus

Part of speech: adjective

Definitions

1. Happening at exactly the same moment as something else, with two or more events taking place together
2. Taking place concurrently, so that several actions or occurrences coincide in time
3. Describing things that occur together in the same instant rather than one after another

Etymology: Latin "simul" meant "at the same time" or "together," and the adjective "simultaneus" was built from it with the suffix "-aneus," which forms adjectives meaning "belonging to" or "pertaining to." English took the Latin form with its ending intact, which is why it looks more like its source than the modern spelling "simultaneous" does. Its meaning has stayed close to the Latin. An event is simultaneous when two or more things happen at once, and the sense has no real shift from the classical root. The pattern is the same as in related Latin-based adjectives such as "instantaneus," which carries the same suffix.