Definition of "doubly" []

• To a double degree; twice: doubly protected; made doubly certain. (adverb)
• In a twofold manner. (adverb)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "To render the title doubly secure, Dauversière and Olier obtained deeds to the island from Lauson and from the Hundred"
• "Hyprocrisy is a sin – doubly so when it organizes - X"
• "By observing radiation even in doubly distilled water, he eliminated the possibility of minute impurities fluorescing in the liquids."