In a manner that is colorless or without color; in a way that corrects for chromatic aberration in optics.
From 'achromatic' + '-ally' (adverb suffix). Formed in the 18th-19th centuries as scientists needed to describe how optical systems functioned without color distortion.
When a telescope operates achromatically, it means every color of starlight arrives at exactly the same spot—a tiny difference that makes the difference between blurry and crystal-clear space images!
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