Dictionary of Human Evolution and Biology

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1. the direction or trend of features in a system.

2. the direction of a morphocline from primitive to derived, i.e. in phylogenetic systematics, the plesiomorphic or apomorphic status of a trait.

3. the direction of magnetism with respect to the poles, considered normal if it matches the earth’s current magnetic field, and reversed if in the opposite direction.

See paleomagnetism.

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