na-adjective, noun which may take the genitive case particle 'no', noun
infinitesimal; very small; minute
Describes an extremely small amount, difference, or change, often in scientific or formal contexts. Can be used as a noun, na-adjective, or no-adjective.
この実験では微少な誤差も許されない。
In this experiment, even an infinitesimal error is not allowed.
微少の差で勝敗が決まった。
The outcome was decided by a very small margin.