CAAabbr. Clean Air ActAmerican Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.caa (k??) or ca’vb, n a Scot word for callcaa (k??) or ca’vb1. to drive or propel2. to knock3. caa canny ca’ canny to proceed cautiously; go slow4. caa the feet frae ca’ the feet frae to send (a person) sprawlingCAA (in Britain) abbreviation for (Aeronautics) Civil Aviation AuthorityCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014caaPast participle: caaedGerund: caaingImperativePresentPreteritePresent ContinuousPresent PerfectPast ContinuousPast PerfectFutureFuture PerfectFuture ContinuousPresent Perfect ContinuousFuture Perfect ContinuousPast Perfect ContinuousConditionalPast ConditionalImperativecaacaaPresentI caayou caahe/she/it caaswe caayou caathey caaPreteriteI caaedyou caaedhe/she/it caaedwe caaedyou caaedthey caaedPresent ContinuousI am caaingyou are caainghe/she/it is caaingwe are caaingyou are caaingthey are caaingPresent PerfectI have caaedyou have caaedhe/she/it has caaedwe have caaedyou have caaedthey have caaedPast ContinuousI was caaingyou were caainghe/she/it was caaingwe were caaingyou were caaingthey were caaingPast PerfectI had caaedyou had caaedhe/she/it had caaedwe had caaedyou had caaedthey had caaedFutureI will caayou will caahe/she/it will caawe will caayou will caathey will caaFuture PerfectI will have caaedyou will have caaedhe/she/it will have caaedwe will have caaedyou will have caaedthey will have caaedFuture ContinuousI will be caaingyou will be caainghe/she/it will be caaingwe will be caaingyou will be caaingthey will be caaingPresent Perfect ContinuousI have been caaingyou have been caainghe/she/it has been caaingwe have been caaingyou have been caaingthey have been caaingFuture Perfect ContinuousI will have been caaingyou will have been caainghe/she/it will have been caaingwe will have been caaingyou will have been caaingthey will have been caaingPast Perfect ContinuousI had been caaingyou had been caainghe/she/it had been caaingwe had been caaingyou had been caaingthey had been caaingConditionalI would caayou would caahe/she/it would caawe would caayou would caathey would caaPast ConditionalI would have caaedyou would have caaedhe/she/it would have caaedwe would have caaedyou would have caaedthey would have caaedCollins English Verb Tables © HarperCollins Publishers 2011