There are 2 definitions of William I in English:

William I1

Syllabification: Will·iam I
( 1143–1214), grandson of David I; king of Scotland 1165–1214; known as William the Lion.

Definition of William I in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up

There are 2 definitions of William I in English:

William I2

Syllabification: Will·iam I
( 1533–84), prince of the House of Orange; first stadtholder (chief magistrate) of the United Provinces of the Netherlands 1572–84; known as William the Silent.

Definition of William I in: