V. S. Apte, The Practical Sanskrit–English Dictionary. Look up any word of the Gita in Devanagari, IAST or Harvard-Kyoto, or browse the headwords letter by letter.
Entry यह्व
यह्वyahvaHeaven and earth.
Heaven and earth.
Of night and day.
Of morning and evening.
Derived forms and compounds
यह्वyahva, Adjective
Vedic
Great, powerful.
Active, restless, continually moving. -Masculine An employer of priests for sacrifices; Latin D. B.