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in a way that is extremely small in amount, degree, or size
- The two designs differed infinitesimally, yet the expert noticed the change immediately.
- The temperature rose infinitesimally, barely enough to register on the scale.
- Her expression changed infinitesimally, betraying just a hint of amusement.
- The planet's orbit shifted infinitesimally over thousands of years.
- He moved his hand infinitesimally closer, testing her reaction.