We found 2 dictionaries that define the word identification numbers:

General (1 matching dictionary)

1. identification numbers: Vocabulary.com

Tech (1 matching dictionary)

2. Reliance Electric motor terms (No longer online)

(Note: See identification_number as well.)

Definitions from WordNet (identification number) ▸ noun:  a numeral or string of numerals that is used for identification ▸ Also see identification_number Phrases: personal identification numbers, more... ▸ Words similar to identification numbers ▸ Usage examples for identification numbers ▸ Idioms related to identification numbers ▸ Wikipedia articles (New!) ▸ Words that often appear near identification numbers ▸ Rhymes of identification numbers ▸ Invented words related to identification numbers