Dictionary Definition:
atiṣṭhā 1
ati-ṣṭhā (√sthā), to be at the head of, govern RV. AV
• to jut over or out TBr
atiṣṭhā 2
ati-ṣṭhā́ f. precedence, superiority ŚBr. &c
• (as). mf. or ati-ṣṭhā́van, in. or atiṣṭhā́-vat āV., mfn. superior in standing, surpassing