i think he is looking for the FAA regulation
Federal Aviation regulations part 61.103 (c)
To be eligible for a private pilot certificate, a person must:
(a) Be at least 17 years of age for a rating in other than a glider or balloon.
(b) Be at least 16 years of age for a rating in a glider or balloon.
(c) Be able to read, speak, write, and understand the English language. If the applicant is unable to meet one of these requirements due to medical reasons, then the Administrator may place such operating limitations on that applicant's pilot certificate as are necessary for the safe operation of the aircraft.
i have always thought that is pretty broad - "read speak write and understand the english language." its a pretty big language... you mean i have to be able to read speak write and understand the ENTIRE language... what if there is a word i dont know? will i have my license revoked or application denied?? LOL

doesnt get any more involved than to say "Read speak write and understand the english language."