Definitions of think of:

• verb:   look on as or consider
• verb:   choose in one's mind

  Example: "Think of any integer between 1 and 25"

• verb:   intend to refer to
• verb:   keep in mind for attention or consideration

  Example: "Think of the starving children in India!"

• verb:   take into consideration, have in view
• verb:   devise or invent