Meaning of 一遇 in Japanese

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Definition of 一遇

いちぐう(ichiguu) 【一遇】

せんざいいちぐう(senzaiichiguu) 【千載一遇】

(n) once in a lifetime (opportunity); (a golden opportunity that may) happen only once in a thousand years

これは私のわたし生涯しょうがいにとって千載一遇せんざいいちぐうの機会きかいです。

This is the chance of a lifetime.

いよいよ千載一遇せんざいいちぐうのチャンスがめぐってきたくる。

At last, a chance in a million arrived.