Yōga Sūtra 3.04

त्रयमेकत्र संयमः।

trayamēkatra saṁyamaḥ।

[त्रयम् एकत्र संयमः।
trayam = these three; ēkatra = at one place; saṁyamaḥ = together-controlled;]

These three (dhāraṇā, dhyāna, and samādhi) together at once is Samyama i.e. together controlled.