व्याक्रीयन्ते अपशब्देभ्यः साधुशब्दाः पृथक्क्रीयन्ते अनेन इति व्याकरणम् ।
vyākrīyante apaśabdebhyaḥ sādhu-śabdāḥ pṛthak krīyante anena iti vyākaraṇam |
(Unknown Source)
“That by which separation is made, that is, that by which proper śabdas [i.e., words] are made separate from [alt., distinguished from] improper śabdas, is vyākaraṇa.”
Alternate version
vyākrīyante apaśabdebhyaḥ sādhu-śabdāḥ pṛthak krīyante yena tad vyākaraṇam |