anumāna

 Anumāna (अनुमान) in Sanskrit refers to inference or reasoning and is one of the principal means of obtaining knowledge (pramāṇa) in Indian philosophy.

Meaning and Linguistic Origin

The Sanskrit word "anumāna" (अनुमान) is a compound of "anu" (after,

following) and "man" (to think, consider, or measure). Literally, it means

“after thinking” or “following reasoning”, and in practical terms, it 

denotes a knowledge derived from inference or logical reasoning 

rather than direct perception.

Philosophical Context

In classical Indian philosophy, particularly in Nyāya school, anumāna

is recognized as one of the pramāṇas, or valid means of knowledge, 

alongside pratyakṣa (perception), śabda (verbal testimony), and others

depending on the school. Anumāna allows one to infer things that are 

not immediately perceptible by observing signs (liṅga) or causes. For

example, seeing smoke on a hill leads one to infer the presence of 

fire — this reasoning is anumāna.

Structure of Anumāna in Nyāya Logic

Nyāya logic traditionally defines anumāna using a five-member syllogism:

Pratijñā (Proposition): Statement to be proved — “There is fire on the hill.”

Hetu (Reason): Basis for inference — “Because there is smoke.”

Udāharaṇa (Example): General example — “Where there is smoke, there

 is fire, as in a kitchen.”

Upanaya (Application): Applying the general rule to the specific case —

 “This hill has smoke, so the rule applies.”

Nigamana (Conclusion): Final inference — “Therefore, the hill has fire.”

The emphasis is not just on observation, but on logical connection

between the observed sign and the inferred fact.

Broader Usage

Beyond strict philosophical discourse, anumāna in Sanskrit can also 

mean estimation, supposition, or conjecture, and is commonly used

in classical and literary texts to refer to reasoning, deduction, or expected 

outcomes.

In summary, anumāna is a key concept in Sanskrit epistemology, 

representing knowledge obtained through inference, with a rigorous

logical structure central to Indian philosophical schools such as Nyāya.