ELF

Noun

 * 1)   a common object file format for Unix
 * 2)   English used by non-native speakers
 * 1)   English used by non-native speakers
 * 1)   English used by non-native speakers
 * 1)   English used by non-native speakers

Proper noun

 * 1)  a radical environmentalism group
 * 2)  an organization that studies the invented languages of
 * 3)  a non-profit organization
 * 1)  a non-profit organization