The Compendium of Caraka 3.8.40

3.8.40

athānumānam---anumānaṃ nāma tarko yuktyapekṣaḥ; yathā---agniṃ jaraṇaśaktyā, balaṃ vyāyāmaśaktyā, śrotrādīni śabdādigrahaṇenetyevamādi//

Now, inference: inference is reasoning dependent on logical connection; for instance, [inferring] the digestive fire by the power of digestion, strength by the capacity for exercise, and the sense of hearing and the others by the apprehension of sound and other objects, and so on.