Emily Dickinson Lexicon

CAL-I-GA'TION, n. [L. caligatio, dimness, from caligo, to be dark.]

Darkness; dimness; cloudiness. In medical authors, caligation or caligo, is an opakeness or cloudiness of the anterior surface of the crystalline lens, causing dimness of sight; impaired sight from obstruction to the passage of light, or cataract. – Coxe. Encyc.