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aerodynamic having a smooth, even shape that offers the least possible resistance to air currents or movement.
force to cause to do something despite resistance or hesitation. [1/6 definitions]
fortify to give more strength, resistance, or energy to; reinforce.
friction the resistance of a surface to motion, as of an object sliding or rolling over it. [1/3 definitions]
passive tending to offer no resistance. [1/2 definitions]