-able or -iblesuff.1. Susceptible, capable, or worthy of a specified action: debatable.2. Inclined or given to a specified state or action: changeable.[Middle English, from Old French, from Latin -?bilis, -ibilis : -?- and -i-, thematic vowels + -bilis, adj. suff.]American 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.-able suffix forming adjectives 1. capable of, suitable for, or deserving of (being acted upon as indicated): enjoyable; pitiable; readable; separable; washable. 2. inclined to; given to; able to; causing: comfortable; reasonable; variable. [via Old French from Latin -?bilis, -?bilis, forms of -bilis, adjectival suffix] -ably suffix forming adverbs -ability suffix forming nounsCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014a?ble (?e? b?l) adj. a?bler, a?blest. 1. having the necessary power, skill, resources, or qualifications to do something: able to read music; not able to vote. 2. having or showing unusual talent, intelligence, skill, or knowledge: an able leader. [1275?1325; Middle English