| range | The set of conditions throughout which an organism (for example, plant species) naturally occurs. (09 Oct 1997) |
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| range of accommodation | The distance between an object viewed with minimal refractivity of the eye and one viewed with maximal accommodation. (05 Mar 2000) |
| range of convergence | The distance between the near point and far point of convergence. Synonym: range of convergence. (05 Mar 2000) |
| range of motion | The range through which a joint can be moved, usually its range of flexion and extension. Due to an injury, the knee may for example lack 10 degrees of full extension. (12 Dec 1998) |
| range of motion, articular | Range through which a joint can be extended and flexed. This is frequently assessed following surgery of the joint. (12 Dec 1998) |
| range, normal | Normal results can fall outside the normal range. By convention, the normal range is set to cover ninety-five percent (95%) of values from a normal population. Five percent (5%) of normal results therefore fall outside the normal range. (12 Dec 1998) |