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A dimictic lake is a body of freshwater whose difference in temperature between surface and bottom layers becomes negligible twice per year, allowing all strata of the lake's water to circulate vertically. All dimictic lakes are also considered holomictic, a category which
Systematically observing the sunrise, people discovered that it occurs between two extreme locations at the horizon and eventually noted the midpoint between the two. Later it was realized that this happens on a day when the duration of the day and the night are practically equal and the word "equinox" comes from Latin aequus, meaning "equal", and nox, meaning "night".
The dates of the solstice varies each year and may occur a day earlier or later depending on the time zone. Because the earth's orbit takes slightly longer than a calendar year of 365 days, the solstices occur slightly later each calendar year, until a leap day re-aligns the calendar with the orbit.
Biennial plant, a plant which blooms in its second year and then dies; Biennale, the Italian word for "biennial" and a term used within the art world to describe an international exhibition of contemporary art, stemming from the use of the phrase for the Venice Biennale. (The English form, "biennial", is also commonly used to describe these art ...
quality-adjusted life year: q.AM: every day before noon (from Latin quaque die ante meridiem) q.d. every day (from Latin quaque die) q.d.s. four times each day (from Latin quater die sumendus) q.h. each hour (from Latin quaque hora) q.h.s. every bedtime (from Latin quaque hora somni) q.i.d. four times each day (from Latin quater in die)
twice daily bib. bibe: drink bis bis: twice b.i.d., b.d. bis in die: twice daily AMA style avoids use of this abbreviation (spell out "twice a day") bis ind. bis indies: twice a day bis in 7 d. bis in septem diebus: twice a week BM bowel movement: commonly used in the United Kingdom when discussing blood sugar.
The 36-year-old was drunk and high on cocaine with a blood alcohol content of .15 – nearly twice the legal limit – with cops recovering a bottle of tequila from his truck.
In any given 100-year period, a 100-year event may occur once, twice, more, or not at all, and each outcome has a probability that can be computed as below. Also, the estimated return period below is a statistic : it is computed from a set of data (the observations), as distinct from the theoretical value in an idealized distribution.