The meaning of SIMULTANEOUS is existing or occurring at the same time : exactly coincident. How to use simultaneous in a sentence. Synonym Discussion of Simultaneous.

SIMULTANEOUS definition: 1. happening or being done at exactly the same time: 2. happening or being done at exactly the…. Learn more.

Definition of simultaneous adjective from the Oxford Advanced Learner's Dictionary. happening or done at the same time as something else. There were several simultaneous attacks by the rebels. They …

Define simultaneous. simultaneous synonyms, simultaneous pronunciation, simultaneous translation, English dictionary definition of simultaneous. adj. 1. Happening, existing, or done at the same time.

WordReference Random House Unabridged Dictionary of American English © 2025 si•mul•ta•ne•ous (sī′məl tā′ nē əs, sim′əl-), adj. existing, occurring, or operating at the same time; concurrent: …