Extrinsic(redirected from extrinsic incubation period)
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EVIDENCE, EXTRINSIC. External evidence, or that which is not contained in
the body of an agreement, contract, and the like.
2. It is a general rule that extrinsic evidence cannot be admitted to contradict, explain, vary or change the terms of a contract or of a will, except in a latent ambiguity, or to rebut a resulting trust. 14 John. 1; 1 Day, R. 8; 6 Conn. 270.