What does temperature sensor accuracy mean?

The datasheet of a sensor might state that for a particular temperature range, e.g. 10C to 50C, the accuracy of the sensor is +/- 0.5C. Does that mean that 100% of the readings obtained by the sensor are guaranteed to be within +/-0.5C or does it mean only say 95% of the readings are guaranteed to be within +/-0.5C?
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