Vṛtti means the process of sustenance, by which the moving beings live upon the nonmoving. For a human, vṛtti specifically means acting for one’s livelihood in a manner suited to his personal nature. Such action may be carried out either in pursuit of selfish desire or in accordance with the law of God.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
वृत्तिर्भूतानि भूतानां चराणामचराणि च । कृता स्वेन नृणां तत्र कामाच्चोदनयापि वा
vṛttirbhūtāni bhūtānāṃ carāṇāmacarāṇi ca | kṛtā svena nṛṇāṃ tatra kāmāccodanayāpi vā
SB 12.7.13