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Ec- Eccentric
- A circle not having a geometric centre.
- Eccentricity
- The variation of the outer diameter of a shaft surface when referenced to
the true geometric centreline of the shaft.
- Eccentricity Ratio
- The vector difference between the bearing centreline and the average steady-state journal centreline.
- Echo
- A delayed return of sound that is perceived by the ear as a discrete sound image.
- Echo Location
- Determining the location of a target relative to the sensor face by means of measuring the time it takes for a sound wave to travel to the target and be reflected back to the sensor
- Echograms
- A record of the very early reverberatory decay of sound in a room.
- Eclipse
- A chance alignment between the Sun and two other celestial objects within the
solar system in which one body blocks the light of the Sun from the other.
- Ecology
- The study of living things in their environment.
- Ecosystem
- A community of living things together with their environment.
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