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 उद्घाटन
उद्घाटनudghāṭanaa.(-नी f.)
(-नीFeminine)
Opening, unlocking; धर्मं यो न करोति निन्दितमतिः स्वर्गार्गलोद्घाटनम् H.1.133.