i) the process of monitoring the condition of equipment through the analysis of properties of its lubricating and other oils. Typically conducted through the measurement of particulates in the oil, or the measurement of the chemical composition of the oil (Spectographic Oil Analysis). Commonly used for monitoring the condition of large gearboxes, engines and transformers, amongst other applications. www.maintenanceresources.com. ii) derived from the Greek tribos meaning I rub. Formally defined, it is the science and technology of interacting surfaces in relative motion and all practices related thereto. In other words, it is the science and technology of friction, lubrication, and wear. The study of tribology is perhaps most commonly applied in bearing design - but extends into other unlikely areas including hair care products such as conditioners. en.wikipedia.org