There are 2 definitions of SIB in English:

SIB

Syllabification: SIB

abbreviation

British
  • Securities and Investment Board, a regulatory body that oversees London’s financial markets.

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Definition of SIB in:

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody

There are 2 definitions of SIB in English:

sib

Syllabification: sib

noun

  • 1chiefly Zoology A brother or sister; a sibling.
    More example sentences
    • In contrast, males that encountered mole-rat scent behaved differently, in several ways, to their sibs that encountered predator scent (at least in high-markers).
    • This allowed experimental chicks to be more successful at competing with sibs (who often had been raised by parents singly or in pairs) when they were returned to their natal nest after the hand-rearing period.
    • In nine cases only one of two same-sex siblings became a breeder; in eight of these it was the heaviest of the two sibs (p =.019, binomial test, n = 9).
  • 2 Anthropology A group of people recognized by an individual as his or her kindred.
    More example sentences
    • Therefore, many researchers expect to see just the sort of discriminating parental investment reported by Mann - behavior that favors more vigorous offspring over their less healthy sibs.

Origin

Old English, 'related by birth or descent', of unknown origin. Sense 1 dates from the early 20th century.

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Definition of sib in:

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody