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n. pl. things-in-them·selves (thĭngz′ĭn-thĕm-sĕlvz′) Philosophy
[Translation of German Ding an sich.]
(Philosophy) (in the philosophy of Kant) an element of the noumenal rather than the phenomenal world, of which the senses give no knowledge but whose bare existence can be inferred from the nature of experience
n., pl. things′-in-themselves′.
(in Kantian philosophy) reality as it is apart from experience. Compare noumenon.
[1650–60; translation of German Ding an sich]