As a Noun:
1. An idea that you have in your mind. English = thought.
2. The organ inside your head that enables you to think and feel things such as heat and pain. English = brain.
As a Verb or Adjective:
1. To use your mind to form an opinion, idea or image of something. English = think.
2. To have an opinion that something is true or the case. English = think. Informal English = reckon.
3. Of an idea or thought, for it to suddenly come into your mind or awareness.