We found 8 dictionaries that define the word efo:

General (3 matching dictionaries)

1. efo: Wordnik
2. EFO: Dictionary.com
3. EFO: Wiktionary

Art (1 matching dictionary)

4. Glossary of Stamp Collecting Terms (No longer online)

Business (1 matching dictionary)

5. EFO: Accounting Glossary

Miscellaneous (2 matching dictionaries)

6. EFO: Acronym Finder
7. AbbreviationZ (No longer online)

Slang (1 matching dictionary)

8. efo: Urban Dictionary

Definitions from Wiktionary (EFO) ▸ noun:  (philately) Initialism of errors, freaks, and oddities. Similar: hea, Af, sop, bf, rdf, tr, pos, wireless network, bush telegraph, phone tag, more... Phrases: Efo riro, more... ▸ Words similar to efo ▸ Usage examples for efo ▸ Idioms related to efo ▸ Wikipedia articles (New!) ▸ Popular adjectives describing efo ▸ Words that often appear near efo ▸ Rhymes of efo ▸ Invented words related to efo