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completely; absolutely; totally
「万」 has another reading with different meanings.
10,000; ten thousand
万まんがいちが一に備えそなえておこう。
Let's prepare just in case.
万ばんぜん全の準備じゅんびで試合しあいに臨んのぞんだ。
I went into the match fully prepared.
万ばんじ事うまくいくように祈っいのっているから安心あんしんして。
I'm praying everything goes well, so don't worry.