In Jainism, Upādāna (sometimes spelled "upadaya") refers to the "matter" or "substance" that is appropriated or taken up by something else. Specifically, the term is often used in Jain philosophy to describe the material cause that is necessary for the production or manifestation of something.

For example, in the context of the Jain doctrine of dravya (substances), upādāna is the material that combines with other conditions to give rise to a particular effect. In the process of karma bondage (āsrava and bandha), upādāna refers to the material karmic particles that bind to the soul due to the soul’s activities (yoga) and passions (kaṣāya).

Thus, upādāna in Jainism means the material cause or the substance that is appropriated or taken up, especially in relation to karma or the processes of change and transformation.

If you meant a different term or need more context, please clarify!