Idea/aɪˈdiːə/ Definition 1 of 5Pro Tip 1/3Action Plan Use 'idea' when suggesting steps to achieve a goal or solve a problem. His idea to increase sales is to improve online marketing. Pro Tip 2/3Sharing Thoughts 'Idea' can be used to politely present your own thoughts in a discussion. I like your point, but my idea is a bit different. Pro Tip 3/3Beginning Brainstorm An 'idea' often introduces the beginning of brainstorming or collective thinking. Let's all share our ideas on the marketing campaign.