Gravity has a familiar physical meaning but also a nonphysical meaningâbasically seriousness. Thus, something grave possesses gravity. You can refer to the gravity of a person's manner, though public figures today seem to have a lot less gravity than they used to have. Or you can talk about a grave situation, as in the example sentence.
A wiki is a website where users can add, remove, and edit every page using a web browser. It's so terrifically easy for people to jump in and revise pages that wikis are becoming known as the tool of choice for large, multiple-participant projects.
A Byki list is a collection of learnable information, usually a set of words or phrases in a foreign language, expressed on flash cards. Byki lists may include sound or images for each card and may be viewed on Byki.com, or downloaded for use in the Express or Deluxe versions of the Byki software for PCs.