unconditional; not restricted or limited by any conditions; existing independently rather than in relation to something else; (of measurements, etc.) regarding a value based only on a specific standard regardless of external conditions (e.g. absolute temperature, absolute weight)

a standard for measuring temperature by defining a zero point and units of graduation, such as the 摄氏温标 shè​shì​wēn​biāo or the 华氏温标 huá​shì​wēn​biāo