Definition: Happening every three years.

Example: The conference is held triennially, bringing together experts from around the world.

Definition: A time span that lasts for three years.

Example: The project will be evaluated at the end of the triennium.

Definition: Happening or being done every three months.

Example: The company holds trimonthly meetings to discuss progress and plans.

Definition: Happening or occurring every three weeks or three times a week.

Example: The magazine is published triweekly, so you can expect a new issue every three weeks.

Definition: Occurring every three weeks or three times a week.

Example: The magazine is published triweekly, so you can expect a new issue every three weeks.

Definition: A publication or event that occurs three times a week.

Example: The magazine is a triweekly, so it comes out every Monday, Wednesday, and Friday.

Definition: A part of something that is divided into twelve equal parts, or the position of being number twelve in a sequence.

Example: He finished twelfth in the race, which was better than he expected.

Definition: The number that comes after eleven and before thirteen, often used to refer to a group of twelve items or people.

Example: There are twelve months in a year.

Definition: A period of twelve months, which is equivalent to one year.

Example: The project will take a twelvemonth to complete.

Definition: A part or position in a series that is number 20.

Example: The twentieth chapter of the book was my favorite.

Definition: On two occasions or two times; used to indicate that something happens two times.

Example: I called her twice yesterday to discuss the project.

Definition: The time of day when the sun is just below the horizon, creating a soft light, especially between sunset and night.

Example: We enjoyed a beautiful walk during twilight as the sky turned shades of purple and orange.