IETF における定義

[1]

In the IETF, the term "internationalization" is used to describe adding or improving the handling of non-ASCII text in a protocol.

[2] RFC 6365 - Terminology Used in Internationalization in the IETF (2011-09-10 19:11:51 +09:00 版) <http://tools.ietf.org/html/rfc6365#page-8>

関連

[3] m17n や l10n も参照。