I. suffix 1. forming adjectives meaning: 2. able to be • calculable.
3. due to be • payable.
4. subject to • taxable.
5. relevant to or in accordance with • fashionable.
6. having the quality to • suitable
– origin from French -able or Latin -abilis; originally found in words only from these forms but later used to form adjectives directly from English verbs ending in -ate, e.g. educable from educate; subsequently used to form adjectives from verbs of all types (influenced by the unrelated word able), e.g. bearable, saleable.