| Noun | 1. | deflection - a twist or aberration; especially a perverse or abnormal way of judging or acting | |
| 2. | deflection - the amount by which a propagating wave is bentbending, bend - movement that causes the formation of a curve | |
| 3. | deflection - the movement of the pointer or pen of a measuring instrument from its zero positionmotion, movement - a natural event that involves a change in the position or location of something | |
| 4. | deflection - the property of being bent or deflected | |
| 5. | deflection - a turning aside (of your course or attention or concern); "a diversion from the main highway"; "a digression into irrelevant details"; "a deflection from his goal"turning, turn - the act of changing or reversing the direction of the course; "he took a turn to the right" red herring - any diversion intended to distract attention from the main issue | |