Definition from Wiktionary, the free dictionary
- (optics) Free from color; transmitting light without color-related distortion.
- Containing components such as achromatic lenses and prisms, designed to prevent color-related distortion.
- (biology) Uncolored; not absorbing color from a fluid; -- said of tissue
- (music) Having only the diatonic notes of the scale; not modified by accidentals.
- Being achromatic in subject
- The lecture was achromatic, the speaker used politics to suppress the weight of his/her subject.
Related terms 
optics: free from colour
containing components to prevent colour-related distortion
being achromatic in subject
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