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The amount, distance, or length between two points; the full extent or reach of anything.
1. The distance from one fixed point to another, as the distance, when the hand is fully expanded, from the tip of the thumb to the tip of the little finger.
2. A length of time.
3.. The duration of a process.
The duration of sustained concentration on a task or activity. See: hyperactivity (2); attention deficit-hyperactivity disorder
A test of memory and attention.See: digit span test
The maximum obtainable age of a member of a species.
The number of words or objects one can store and recall when asked to do so. See: digit span test