How many dimensions are defined till now?

We have learnt from school that there are three dimensions lenght,breadth and width.Professor Stephen Hawking suggests that there is a fourth dimension of 'time'.I live in India and my teachers used to say that ancient saints in India had abilities to see upto 12 dimensions.
When I google I feel confused by the large volumes of undigestable information available(mostly relating to trigonometry).I would like to know what is your understanding about the number of different dimensions.
Any information regarding the concepts would be helpful.

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