Grammatical Analysis
Nimitta: [nt.] sign; mark; image; target; underlying cause; defining characteristic. From root mā (to measure, mark out).
Orthodox Definition
In Theravāda meditation architecture, Nimitta is the critical technical term for the meditation object or the mental image that the mind locks onto to develop concentration (samādhi).
While wandering in saṃsāra, the mind grabs onto the “signs of beauty” (subha-nimitta) or the “signs of irritation” (paṭigha-nimitta), which generate greed and hatred. In samatha practice, the meditator trains the mind to ignore those worldly signs and lock onto a pure, static meditation sign (like a colored disc or the breath).
As concentration deepens, the nimitta undergoes a profound psychological evolution, transforming from a physical object into a brilliantly clear, mind-generated image. This transformation is the exact metric used by orthodox meditation masters to gauge a practitioner’s proximity to jhāna.
Textual References
- Sutta: Mahāvedalla Sutta (MN 43) – Discussing the “signless” (animitta) liberation of mind, achieved by actively paying no attention to all signs.
- Canonical: Aṅguttara Nikāya (Tika Nipāta) – Warning that a monk must master the “nimitta of concentration” or his mind will scatter.
- Commentary: Visuddhimagga (Chapter IV) – The definitive source mapping the structural evolution of the meditation sign from the physical realm into the purely mental realm.