infinitesimal

US /ˌɪn.fɪ.nəˈtes.ə.məl/
UK /ˌɪn.fɪ.nəˈtes.ə.məl/
"infinitesimal" picture
1.

extremely small; incalculably or immeasurably minute.

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The chances of winning the lottery are infinitesimal.
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Even an infinitesimal amount of poison can be deadly.
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