4. (forming adjectives) relevant to or in accordance with: "fashionable"
5. (forming adjectives) having the quality to:"suitable"
Word Originfrom 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.