I.2 yoga cittavrtti nirodhah

Yoga is the cessation of the fluctuations of the mind.

II.44 svādhyāyāt istadevatā samprayogah

Self-study leads towards the realization of God or communion with one’s desired deity.

III.1 desa bandhah cittasya dhāranā

Fixing the consciousness on one point or region is concentration (dharana)

III.2 tatra pratyaya ekatānatā dhyānam

A steady, continuous flow of attention towards the same point or region is meditation (dhyāna)