恒加速度 héngjiāsùdù constant acceleration Origin Definitions Defs Strokes Stroke Words Sentences Sents 恒 恆 héng nounadjective permanent permanent; constant; lasting; fixed加速度 jiāsùdù acceleration the rate at which an object changes its velocity over time; common units include meters per second squared (m/s²) and centimeters per second squared (cm/s²)