Yoga Sutras of Patanjali · 1.42

तत्र शब्दार्थज्ञानविकल्पैः संकीर्णा सवितर्का समापत्तिः ॥४२॥

tatra śabdārthajñānavikalpaiḥ saṁkīrṇā savitarkā samāpattiḥ

When engrossment is mixed with the imagination of word, meaning, and knowledge, it is called samadhi with reasoning.

— Yoga Sutras of Patanjali 1.42

Source: Sanskrit attributed to Patanjali (c. 2nd century BCE – 4th century CE). Public-domain English readings drawn from Swami Vivekananda's 'Raja Yoga' (1896) and Charles Johnston's 'The Yoga Sutras of Patanjali' (1912).