Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
Gram. in Latin, a grammatically independent phrase containing a noun in the ablative case and a participle, pronoun, or second noun also in the ablative case, used to express time, cause, or circumstance
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The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
In Latin grammar, an adverbial phrase syntactically independent from the rest of the sentence and containing a noun or pronoun plus an adjunct, usually a participle or adjective, with both elements in the ablative case.