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From Biology-Online Dictionary | Biology-Online Dictionary
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An impossibility. 'Madam, quoth he, this were an impossible!' (Chaucer)

Not possible; incapable of being done, of existing, etc.; unattainable in the nature of things, or by means at command; insuperably difficult under the circumstances; absurd or impracticable; not feasible. With men this is impossible; but with god all things are possible. (Matt. Xix. 26) Without faith it is impossible to please him. (Heb. Xi.

(Science: mathematics) impossible quantity, an imagnary quantity. See imaginary.

Synonym: see impracticable.

Origin: f, fr. L. Impossibilis; pref. Im- not _ possibilis possible. See possible.