Etymology
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harbour

chiefly British English spelling of harbor (n. and v.); for spelling, see -or. In this case it is considered to be without etymological justification and probably by analogy of labour.

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Definitions of harbour
1
harbour (v.)
secretly shelter (as of fugitives or criminals);
Synonyms: harbor
harbour (v.)
keep in one's possession; of animals;
Synonyms: harbor
harbour (v.)
hold back a thought or feeling about;
Synonyms: harbor / shield
harbour (v.)
maintain (a theory, thoughts, or feelings);
Synonyms: harbor / hold / entertain / nurse
2
harbour (n.)
a sheltered port where ships can take on or discharge cargo;
Synonyms: seaport / haven / harbor
harbour (n.)
a place of refuge and comfort and security;
Synonyms: harbor
From wordnet.princeton.edu