1. to share the same opinion; agree.
examples: We concur that this is not a simple matter, but we must act quickly nonetheless; The specialist concurred with the primary care physician regarding the diagnosis; I concur with your estimate of the damage.
2. to act or work together; cooperate.
example: They concurred in opposing higher taxes.
3. to happen at the same time; coincide.
example: The height of the storm concurred with a high tide.