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Southern Oscillation

noun

Definition of Southern Oscillation 

climatology

: a periodic seesaw fluctuation in sea-level atmospheric pressures over the southern Pacific and Indian oceans that is believed to be linked to El Niño and La Niña events — compare arctic oscillation, north atlantic oscillation

First Known Use of Southern Oscillation

1923, in the meaning defined above

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The first known use of Southern Oscillation was in 1923

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