vers-, vert-, -verse, -version, -version, -versation, -versary, -vert, vort-, vors-

1. A date that is observed on an annual basis because it is the same date as an important event in a past year; such as, the date of someone's wedding.
2. A celebration or other commemorative ritual marking the date of an important event.
3. Etymology: from Latin anniversarius, "returning annually", from annus, "year" + versus; past participle of vertere. "to turn". The adjective came to be used as a noun in Church Latin as anniversaria dies with reference to saints' days.

The year rolls around to bring the anniversary of birth, marriage, or some other event; and this "turning" of the year is the literal meaning of the word anniversary.

An animal living wholly or chiefly in or on water.

Spontaneous invagination of the gallbladder into the transverse colon with formation of an opening between the two organs.

Disliking; unwilling; having a feeling of great distaste or an inclination against something or someone; disinclined, antipathetic: "My father is always averse to spending money."
"I do not approve of liquor in any form and I am even averse to drinking wine."

1. To turn away.
2. To ward off or to prevent.

A man who averts danger wards it away from himself; to avert one's eyes is to turn them away.

1. To turn aside, to turn away, to turn: "She averted her head so we could not see her face."
2. To prevent, to turn away, to avoid something, to ward off: "The quick arrival of fire-fighters averted a major forest fire."

A man who averts danger wards (turns) it away from himself; to avert one's eyes is to turn them away.

1. The microbial conversion of a chemical into a compound of economic importance, or the conversion of organic material into a source of energy, using biological processes or organisms.
2. Any of various processes that use plants or micro-organisms to change one form of energy into another form; such as, the fermentation of carbohydrates into alcohol; the digestion of organic wastes, or sewage, with micro-organisms to produce methane.
3. The conversion of biomass into usable energy; such as, by burning solid fuel for heat, by fermenting plant matter to produce liquid fuel, as ethanol, or by the bacterial decomposition of organic waste to produce methane.

1. The number and variety of organisms in a given locality, community, or ecosystem at a given time.
2. In different contexts it may denote: the number of different species present in a given environment (species diversity); the genetic diversity within a species (genetic diversity); the number of different ecosystems present in a given environment (ecological diversity).

High biodiversity is typical of complex and highly productive ecosystems; such as, tropical rain forests, where a small area can contain many different species of animals, plants, and other organisms.

Biodiversity is often used as an indicator of the health of such ecosystems.