The term simultaneous means happening or occurring at the same time, without any delay or gap in between. It refers to an event that takes place concurrently with another event, where both events share the same moment and are not separated by a period of time. In other words, it is something that happens together with something else, rather than one happening before the other. The term can be used to describe various situations such as simultaneous translation, which refers to translating text from one language to another in real-time, or simultaneous equations, where multiple equations are solved at once using algebraic methods.