Wide QVGA or WQVGA is any display resolution having the same height in pixels as QVGA, but wider. This definition is consistent with other 'wide' versions of computer displays.
Since QVGA is 320 pixels wide and 240 pixels high (aspect ratio of 4:3), a 16:10 aspect ratio wide version would be 384 pixels wide. A 5:3 aspect ratio wide version would be 400 pixels wide. Ratios of N:9 are not practical because 240/9 is not an integer.
WQVGA has wrongly been used to describe displays that are not 240 pixels high, for example Sixteenth HD1080 displays which are 270 or 272 pixels high. This may be due to QVGA having the nearest screen height.
