Pronunciation: [mˈiːn tˈa͡ɪm] (IPA) 
The proper spelling of the term "mean time" is /miːn taɪm/. The word "mean" in this context refers to a mathematical average, as opposed to the word "mean" meaning cruel or unpleasant. "Time" is spelled as it sounds, with the 't' being pronounced at the end. "Mean time" refers to a calculation of the average time it takes for the Earth to make one rotation, and is important for accurately measuring time and creating calendars.
Mean time refers to the average or typical duration of a particular event or activity. It is a statistical concept used to represent the average duration or interval between occurrences. Mean time is calculated by summing up the individual times and dividing it by the total number of occurrences.
In the context of project management or scheduling, mean time is often used to estimate the average duration of a task or activity. It provides a baseline for determining the expected time required for completing a specific task, serving as a guideline for the project manager to plan and allocate resources accordingly.
In the field of reliability engineering or maintenance management, mean time is used to represent the average time elapsed between failures of a particular system or component. It helps in assessing the reliability and performance of the system, and assists in predicting future failures or maintenance requirements.
Mean time can also be used to describe the average time spent on a particular activity or process. For example, mean time spent on a website refers to the average duration users spend on browsing the site. It is often used to evaluate user engagement and determine the effectiveness of the website design and content.
Overall, mean time provides a quantitative measure of the average duration or interval of an event or activity, serving as a useful tool in project management, reliability assessment, and performance evaluation.
Time as measured by a perfect clock, or as reckoned on the supposition that all the days of the year are of a uniform length.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The term "mean time" comes from the Old English word "gemǣne", meaning common or shared, and the word "time", which originated from the Old English word "tīma". In astronomy and navigation, the concept of "mean time" was developed to account for the irregularities in the Earth's rotation and provide a uniform measure of time. This average or mean time, calculated by averaging the variations in solar time over a year, became known as "mean time".
