How can I determine the 'dimension' of a parity check matrix? I find it difficult to even understand what the dimension actually is.

If I have a matrix, e.g.

H =

| 1 0 1 1 0 0 0 |
| 0 1 0 1 1 0 0 |
| 0 0 1 0 1 1 0 |
| 0 0 0 1 0 1 1 |

Then what is the dimension of this matrix? I assume the length of the matrix would be 7?