Emily Dickinson Lexicon

AT-TEN-U-A'TION, n.

1. The act of making thin, as fluids; as, the attenuation of the humors.
2. The act of making fine, by comminution, or attrition. The action of the air facilitates the attenuation of these rocks. – Trans. Chaptal.
3. The act or process of making slender, thin or lean.