which one is the longest length between 10⁰decimeters , 10⁵ millimeters, 10‐⁷ nanometer, 10‐² centimeter and 10¹ meters​

Allusion and illusion. an allusion is an indirect reference, whereas an illusion is something that is unreal or incorrect. each of the nouns has a related verb form: allude “to refer indirectly to,” and illude (not a very common word), which may mean “to delude or deceive” or “to subject to an illusion.”