Assertion: motion's motion | /r/HasProperty | two-dimensional vector
Facets:
value: effectively
type: MANNER
Source sentences:
text: The proper motion is a two-dimensional vector (because it excludes the component in the direction of the line of sight) and is thus defined by two quantities: its position angle and its magnitude.
text: Motion along a curved path may be considered effectively one-dimensional if there is only one degree of freedom for the objects involved.