Idea
This is an old revision of this page, as edited by DavidB4 (talk | contribs) at 22:12, February 14, 2018. It may differ significantly from current revision.
An idea is an abstract thought or concept which people use to communicate their beliefs or plans. Like the words energy, and mass it is difficult to define; you just have to describe it.
Generally, an idea is a plan one conceives for action. Less practically, an Idea, (capitalized), is a central meaning or purpose, it's a notion, an opinion.