semidiurnal

adjective
semi·di·ur·nal | \ˌse-mē-dī-ˈər-nᵊl, ˌse-ˌmī-, -mi-\

Definition of semidiurnal 

1 : relating to or accomplished in half a day

2 : occurring twice a day

3 : occurring approximately every half day the semidiurnal tides

First Known Use of semidiurnal

1594, in the meaning defined at sense 1

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The first known use of semidiurnal was in 1594

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