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English Words Starting With M
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- mean deviation/miːn ˌdiːviˈeɪʃən/A statistical measure of dispersion that calculates the average absolute difference between each data point and the mean of the dataset.nounRare
- mean distance/miːn ˈdɪstəns/A specific mathematical/statistical term referring to the average distance between points, typically calculated by summing all individual distances and dividing by their number.nounB2
- mean free path/ˌmiːn friː ˈpɑːθ/The average distance a particle (like a molecule or electron) travels between collisions with other particles.nounC2
- mean length of utterance/miːn leŋθ əv ˈʌt(ə)rəns/A measure used in child language acquisition research, calculated as the average number of morphemes (meaningful units) per utterance in a language sample.nounC2
- mean lethal dose/ˌmiːn ˈliːθəl ˈdəʊs/The amount of a substance, such as a drug, chemical, or radiation, that is calculated to be fatal to 50% of a defined population of test organisms (e.g., animals) under specific, controlled conditions.nounVery Low
- mean life/miːn laɪf/The average lifetime of a particle, atom, or unstable entity before it decays or undergoes a transformation.nounC2 / Very Low
- mean line/miːn laɪn/In typography and handwriting, the imaginary horizontal line that runs along the tops of lowercase letters, excluding ascenders.nounLow
- mean noon/ˌmiːn ˈnuːn/The moment when the mean sun crosses the local meridian, defining noon for civil timekeeping purposes, averaged over a year.nounC1
- mean planet/miːn ˈplæn.ɪt/A figurative phrase describing an uninhabitable, hostile, or extremely challenging planet.nounRare
- mean proportional/ˌmiːn prəˈpɔːʃ(ə)n(ə)l/The number that, when used twice in a proportion, creates equality between the ratios of the extremes and the means; specifically, for two given numbers a and b, the mean proportional x is such that a/x = x/b, meaning x = √(ab). It is the geometric mean.nounC2
- mean sea level/ˌmiːn ˈsiː ˌlev.əl/The average level of the ocean's surface, used as a standard reference point for measuring land elevation and sea depth.nounC1/C2
- mean solar day/ˌmiːn ˌsəʊ.lə ˈdeɪ/A 24-hour period, defined as the average time it takes for the Sun to return to the same position in the sky, used as the standard civil day.nounC2
- mean solar time/miːn ˈsəʊlə taɪm/Time based on the average length of a solar day, calculated from the Sun's apparent motion as if it moved at a constant rate, ignoring its actual observed position due to the Earth's elliptical orbit and axial tilt.nounVery Low
- mean square/ˌmiːn ˈskweə/A statistical measure: the average of the squares of a set of numbers or values.nounC1/C2
- mean square deviation/miːn skweə ˌdiːvɪˈeɪʃən/A statistical measure of the dispersion or variability of a dataset, calculated as the square root of the variance. Also known as the root mean square deviation or standard deviation.nounC1
- mean sun/ˌmiːn ˈsʌn/A theoretical, uniform-moving sun used as a reference in astronomy and timekeeping, averaging the apparent sun's irregular motion along the ecliptic.nounC2
- mean time/ˈmiːn ˌtaɪm/The average amount of time between two events, particularly the time between failures of a system or device.nounMedium (high in technical fields, low in general conversation)
- mean value/miːn ˈvæljuː/In mathematics and statistics, the average of a set of numbers, calculated by adding them together and dividing by the count of numbers.nounB2
- mean value theorem/ˌmiːn ˈvæljuː ˈθɪərəm/A fundamental theorem in calculus which states that for a continuous, differentiable function over a closed interval, there exists at least one point where the instantaneous rate of change (derivative) equals the function's average rate of change over the interval.nounVery Low
- mean-tone tuning/ˈmiːn təʊn ˈtjuːnɪŋ/A historical system of tuning keyboard instruments where the fifths are made slightly smaller than acoustically pure, producing sweeter-sounding major thirds in some keys at the expense of making others unusable.nounLow
Showing 3021–3040 of 8594 words.