Definition of -able in English:

-able

Pronunciation: /əb(ə)l/

suffix

Forming adjectives meaning:
1Able to be: calculable
2Due to be: payable
3Subject to: taxable
4Relevant to or in accordance with: fashionable
5Having the quality to: suitable comfortable

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.

Definition of -able in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up