We found 3 dictionaries that define the word first digit:

General (1 matching dictionary)

1. first digit: Wiktionary

Computing (1 matching dictionary)

2. First digit: Encyclopedia

Medicine (1 matching dictionary)

3. First digit: Medical dictionary

Definitions from Wiktionary (first digit) ▸ noun:  Synonym of thumb ▸ Words similar to first digit ▸ Usage examples for first digit ▸ Idioms related to first digit ▸ Wikipedia articles (New!) ▸ Words that often appear near first digit ▸ Rhymes of first digit ▸ Invented words related to first digit