What does 通 in a Chinese-Chinese dictionary entry mean?

[Yadang]

See the screenshot below:

 

If I then go to the dictionary entry for 愣 I see:

 

 

...The 2nd definition for 愣 is the same as that for 怔

 

What does this mean about the relation between 怔 and 愣?

[Tomsima]

'Same as' ('coherent with…')

 

The dictionary is telling you the Taiwan 怔 is used equivalently with the Taiwan+mainland usage of 愣 (in its second meaning as listed)

[歐博思]

 通用 interchangeable with「xyz」