noun, Chemistry. 1. any of two or more isomers that differ only in the position occupied by a substituent.
noun 1. a formal, usually detailed written statement, especially regarding a single issue, that articulates a position, viewpoint, or policy, as of a government, organization, or political candidate.
- Position sense
position sense n. See posture sense.
- Positive accommodation
positive accommodation n. Accommodation for near vision by contraction of the ciliary muscles of the eye.