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Webster 1913 Edition

(-ment)

Noun.

The act of abetting;

as, an

abetment

of treason, crime, etc.

Noun.

The act of abetting.

abetment ‎(plural abetments)

act of abetting

↑ Lesley Brown (editor), The Shorter Oxford English Dictionary, 5th edition (Oxford University Press, 2003 [1933], ISBN 978-0-19-860575-7), page 4