Physics. the distance, measured in the direction of propagation of a wave, between two successive points in the wave that are characterized by the same phase of oscillation. on the same wavelength, in sympathy or rapport: We seemed to be on the same wavelength from the moment we met.
Causes of Elbow Pain. Elbow pain is sometimes due to arthritis, but in general, most elbow pain results from overuse injuries. Sports or any activities and professions that require repetitive hand, wrist or arm movements are more prone to elbow injury. Common causes of elbow pain are bursitis, elbow strains, and arthritis.
Elbow bursitis can occur for a number of reasons. 1  Trauma: A hard blow to the tip of the elbow can cause the bursa to produce excess fluid and swell. 2  Prolonged pressure: Leaning on the tip of the elbow for long periods of time on hard surfaces, such as a tabletop, may cause the bursa to swell.