What is Thought ?
Thought is (noun) 1. an idea which you have when thinking He had an awful thought suppose they had left the bathroom taps running? 2. the process of thinking He sat deep in thought by the window. after much thought after thinking a lot about something 3. an opinion He expressed his thoughts on the subject in a letter to the newspaper. 4. to have second thoughts about something to change your mind about something I think she’s beginning to have second thoughts about accepting the job. on second thoughts having thought about it again I asked for coffee, but on second thoughts I think I’ll have tea. (verb) think
source: Easier English, Student Dictionary Upper Intermediate Level