Meaning of 一切１ in Japanese

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Definition of 一切１

いち(ichi) · ひと(hito) · イー(ii) 【一 ·１】

(num, pref) one
(suf) best in; the most (...) in (where an adjective follows)
津山一高い山は滝山だと思っていました。
I thought the highest mountain in Tsuyama was Takiyama.

いっさい(issai) 【一切】

(n, adj-no, n-suf) all; everything; the whole; lock, stock, and barrel
それは他のいっさいに勝っている。
It is paramount to all the others.
(n-adv) absolutely not (with negative); without exception; entirely not