One of the mysteries of the English language finally explained.
Attributive Designating the study of an industrial or other operation with regard to the time taken and method followed in carrying out each of its constituent tasks, usually with a view to improving efficiency; relating to, concerned with, or involving study of this kind. Compare earlier time study.
Early 20th century. From time + and + motion.
time and motion/ˌtʌɪm ən(d) ˈməʊʃn/
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