समासsamāsa1 Aggregation, union, composition.
Derived forms and compounds
स च यो यत्प्रभावश्च तत्समासेन मे शृणु ॥
कोशःDictionaries
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.