Depression and addiction, for example, have several things in common, including: 1  Loss of interest in once-enjoyable activities. 2  Fatigue. 3  Feelings of hopelessness. 4  Reckless behavior. 5  Irritability.
Deflection Temperature Testing of Plastics. The deflection temperature is a measure of a polymer's ability to bear a given load at elevated temperatures. The deflection temperature is also known as the 'deflection temperature under load' (DTUL), 'heat deflection temperature', or 'heat distortion temperature' (HDT).
Wiktionary(5.00 / 1 vote)Rate this definition: 1  deflection(Noun) The act of deflecting or something deflected. 2  deflection(Noun) The deviation of a needle or other indicator from its previous position.