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From The Collaborative International Dictionary of English v.0.48:
Frictional \Fric"tion*al\, a. Relating to friction; moved by friction; produced by friction; as, frictional electricity. [1913 Webster] Frictional gearing, wheels which transmit motion by surface friction instead of teeth. The faces are sometimes made more or less V-shaped to increase or decrease friction, as required. [1913 Webster]