We found 7 dictionaries that define the word 2:

General (4 matching dictionaries)

1. 2 (All Girl Summer Fun Band album), 2 (Amaia Montero album), 2 (Darker My Love album), 2 (Dover album), 2 (Mac DeMarco album), 2 (Mudcrutch album), 2 (Ned Collette album), 2 (Netsky album), 2 (New York City Subway service), 2 (Nik & Jay album), 2 (Olivia Newton-John album), 2 (Pole album), 2 (Retribution Gospel Choir album), 2 (Rockapella album), 2 (Smoking Popes EP), 2 (Smoking Popes album), 2 (Strings album), 2 (The Black Heart Procession album), 2 (The Gloaming album), 2 (Thee Oh Sees album), 2 (disambiguation), 2 (film), 2 (glyph), 2 (number): Wikipedia, the Free Encyclopedia
2. [?]2: Collins English Dictionary
3. (C2H4NH)2, (CO.H)2, (IC)2, (ISC)2: Dictionary.com
4. (COOH)2: Wikipedia, the Free Encyclopedia

Art (1 matching dictionary)

5. Virginia Tech Multimedia Music Dictionary (No longer online)

Computing (1 matching dictionary)

6. 2 (number), 2 (year): Encyclopedia

Miscellaneous (1 matching dictionary)

7. (IC)2, (ISC)2: Acronym Finder

(Note: See two as well.)

Definitions from WordNet (2) ▸ noun:  the cardinal number that is the sum of one and one or a numeral representing this number ▸ adjective:  being one more than one Similar: how so, as is, to say the least, what is more, how come, to boot, just the same, every time, more often than not, as well, more... Opposite: non-binary, multiple, plural, many, several Types: binary, octal, decimal, hexadecimal, more... Phrases: j 2, l 2, Interleukin 2, k 2, cox 2 inhibitor, more... ▸ Words similar to 2 ▸ Usage examples for 2 ▸ Idioms related to 2 ▸ Wikipedia articles (New!) ▸ Popular adjectives describing 2 ▸ Popular nouns described by 2 ▸ Words that often appear near 2 ▸ Rhymes of 2 ▸ Invented words related to 2