: the measured or measurable period during which an action, process, or condition exists or continues
: a nonspatial continuum that is measured in terms of events which succeed one another from past through present to future
: the point or period when something occurs
Time is a word created by mankind, used to describe the concept of order among events that we, as human beings are aware of and perceive. We categorize these events into three basic sets: events that have already happened, events that are happening, and events that could happen - our past, our present and our future. For most of us, that concept of order will be the only way we will ever perceive and understand the world around us, and our own existence.