Meaning
The person on a sound system who chooses and plays the records — the equivalent of what much of the world calls a DJ. The selector reads the crowd, drops the right tunes at the right moment, and calls for wheel-ups; the deejay, by contrast, is the one on the mic.
Examples
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Di selector know exactly wah di crowd waan.
The selector knows exactly what the crowd wants.
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Big up di selecta!
Respect to the selector!
'Selecta' is the common spoken form.
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A good selector mek or break di dance.
A good selector makes or breaks the party.
Origin
From English 'selector', one who selects — here the records — a role that has existed on Jamaican sound systems since the 1950s.
How it’s used
Usually said 'selecta'. Remember the Jamaican split: the selector plays the music, the deejay chats over it.