a suffix used to form adjectives, especially from verbs, to denote ability, liability, tendency, worthiness, or likelihood, as in teachable, perishable, obtainable, but also attached to other parts of speech (especially nouns) as in objectionable, peaceable, and even verb phrases, as in get-at-able.

{Middle English, from Old French, from Latin -ābilis}
Usage: Words ending in e often lose the e when -able is added to them (note becomes notable, argue becomes arguable). But some writers retain the e, especially where there may be confusion. For example, some prefer rateable to ratable, to keep a clear visual connection with rate rather than rat. If a word ends in ce or ge, the e is retained in order to keep the c sounding as s and the g sounding as j, as in traceable and manageable.

Australian English dictionary. 2014.

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