Pronunciation IPA (key): /ˈθɪŋkɪŋ/ Audio (US)(file) Verb Plain form think Third-person singular thinks Past tense thought Past participle thought Present participle thinking The present participle of think. Noun Singular thinking Plural none Thinking is on the Academic Vocabulary List. Your thinking about a topic is your thoughts, opinions and ideas. She's done some really good thinking on this topic. My thinking on the topic has changed as new information has come in.Wikiwand - on Seamless Wikipedia browsing. On steroids.