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{{#category_index:E|eccentricity}} (ek, sen tris’ ∂ t∂) 1. The ratio of the focus-to-center distance to the length of the semimajor axis for an ellipse; see Figure E-12. 2. The condition occurring when the source is not located at (or perpendicularly offset to) the center of what is intended to be a split spread. This occurs on marine records when a separate source boat is employed.