A frame of reference is also a system of lines and clocks that you can use to measure the position and motion of a set of objects and events in relation to each other.
A-frame
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A-Frame in In-line skating. A wide stance used to start turning movements. It aids the skater in maintaining balance and a low center of gravity.
A-frame meaning & definition 1 of A-frame.
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a simple house shaped like an A, with two of its four walls sloping and meeting at the top to act as a roof:
A-frame meaning & definition 2 of A-frame.
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