It seems ironic to be defining the term 'dictionary,' but here we go! Dictionaries are resources for finding word meanings, parts of speech, word origins and even synonyms and antonyms. Dictionaries have definitely evolved over the years. The English language really began with the Anglo-Saxons in Great Britain.
If it is a US Passport, that it is the 9 digit number located in the top corner of the passport info page. In the example below the passport number is 31195855. Other Countries have different types of numbers (usually with letters added) but most often it's in the same place. This Canadian Passport number is AB504966.
Passports are usually an acceptable form of identification, since they contain a photo, name, address and date of birth. To verify that a passport is legitimate, the passport number should be confirmed. Every valid U.S. passport will contain an identification number, which is registered to the person who holds the document. The identification number is located on the photo page of the passport in the upper-right corner.