Also means
poll
Usage Note
Sondeo means an opinion poll or survey (sondeo de opinión) and also, more literally, a probe or sounding in geology and medicine (sondeo petrolífero = oil probe). In political journalism it appears constantly alongside encuesta; the two are nearly synonymous, though sondeo can feel slightly more like a 'quick pulse-check'. The verb is sondear.
Examples
"El sondeo muestra que el partido pierde apoyos."
Natural Translation
The poll shows that the party is losing support.

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