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Hi Alan,
An oscillator is normally a gain element (amplifier) with some positive feedback that only feeds the frequency required. The output is normally a sine wave but it can provide other wave shapes.
A multivibrator is normally two inverting elements ( transistors or valves) that are cross coupled so that a state change on one element forces an opposite state change in the other element. The cross couplings provide a little delay that determines the frequency of operation. The output is normally a square or pulse wave.
HTH
Peter
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