Etymology
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boarder (n.)

1520s, "one who has food and/or lodging at the house of another," agent noun from board (v.) in the "be supplied with food" sense. Nautical meaning "one who boards (an enemy's) ship" to attack it is from 1769, from a verbal sense derived from board (n.2).

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Definitions of boarder

boarder (n.)
a tenant in someone's house;
Synonyms: lodger / roomer
boarder (n.)
someone who forces their way aboard ship;
stand by to repel boarders
boarder (n.)
a pupil who lives at school during term time;
From wordnet.princeton.edu