1. A Paryāya (mode) or an unit for measuring the intensity of a quality.
guṇāḥ- aṃśaḥ paryāyaḥ.
(Anuma Vṛ Pa 101)
2. Quality- The concomitant characteristic of the Dravya (substance), which subsists in a substance (which becomes its substratum); but it (quality) itself is not possessed of any quality.
dravyāśrayā nirguṇā guṇāḥ.
(Tasū 5.40)
guṇāḥ sahabhāvī dharmo yathātmani vijnānavyakiiśaktyādiḥ.
(Pranata 5.7)