parallax

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-- The absence of stellar parallax was the great objection to any theory of the earth's motion prior to Kepler's time.

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Definitions (18)

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  1. noun An apparent change in the direction of an object, caused by a change in observational position that provides a new line of sight.

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Etymologies (2)

Toggle American Heritage etymologies American Heritage Dictionary (1)

  1. French parallaxe, from Greek parallaxis, from parallassein, to change : para-, among; see para-1 + allassein, to exchange (from allos, other; see al-1 in Indo-European roots).

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  1. = French parallaxe = Spanish paralaje, paralajis = Portuguese parallaxe = Italian parallasse, from Greek παράλλαξις, alternation, parallax, from παραλλάσσ, σ1ειν, make things alternate, from παρά, beside, + ἀλλάσσ, σ1ειν, change, from ἄλλος, another.
 

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/ˈpærəlæks/
by American Heritage

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