Definition: an expression giving one idea, either a single or a composite one. A positive statement and its negation, so also, a general rule and its exception are looked upon as making a single sentence on account of their mutual expectancy even though they be sometimes detached from each other cf. विदेशस्थमपि सदेकवाक्यं भवति M. Bh. on III.4.67; cf. also निषेधवाक्यानामपि निषेध्यविशेषाकाङ्क्षत्वाद्विध्येकवाक्यतयैव अन्वयः । तत्रैकवाक्यता पर्युदासन्यायेन । संज्ञाशास्त्रस्य तु कार्यकालपक्षे न पृथग्वाक्यार्थबोधः । Par. Śek on Pari. 3. Such sentences are, in fact, two sentences, but, to avoid the fault of गौरव, caused by वाक्यभेद, grammarians hold them to be composite single sentences.