Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
praestantĭa, ae, f. [praestans], preeminence, superiority, excellence (class.): excellentia praestantiaque animantium reliquorum, over other creatures, Cic. Off. 1, 28, 97: virtutis, ingenii, fortunae, pre-eminence in, id. Lael. 19, 70: di omnium rerum praestantiā excellentes, in all things, id. Div. 2, 63, 129: dignitatis, id. de Or. 2, 52, 209: remedii, Plin. 12, 3, 7, § 16: vulneribus sanandis tanta praestantia est, ut, etc., of such superior efficacy, id. 27, 6, 24, § 42.