Entry 1 sense Webster, 1913 Declinable · De·clin·a·ble · IPA /dɪˈklaɪnəbəɫ/ 01 a. Capable of being declined; admitting of declension or inflection; as, declinable parts of speech. 1. Capable of being declined; admitting of declension or inflection; as, declinable parts of speech.