infinitesimally
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/ˌɪnfɪnɪˈtesɪməli/
🇬🇧
/ˌɪnfɪnɪˈtesɪməli/
in a way that is extremely small or very close to zero
The surface of the mirror was polished to be infinitesimally smooth.
镜子的表面被抛光得微乎其微地光滑。