Meaning of 一石 in Japanese

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Definition of 一石

いっせき(isseki) 【一石】

いっこく(ikkoku) 【一石】

いっせきにちょう(issekinichou) 【一石二鳥】

(exp) killing two birds with one stone
その提案一石二鳥を狙ったものだろうけど、「虻蜂とらず」にならなければいいけどね。
That proposal may be a way to kill two birds with one stone, but we also have to be careful not to get greedy and spoil everything.

いっせきをとうじる(issekiwotoujiru) 【一石を投じる】

(exp, v1) to create a stir; to make waves; to raise a question about; to cause a sensation