Altaic languages

Altaic is a language system that includes the Turkic languages, Mongolic, and the Tungusic languages. That is probably the meaning attributed to "Altaic" by most general linguists. 
It has disputed language families, but only a few linguists still believe that it existed. It supposedly had 66 languages that are now spoken by about 348 million people, mostly in and around Central Asia and northeast Asia.
However, since the publication of Gustaf John Ramstedt's "Einführung" in 1952–1957, most Altaicists have included Korean in Altaic. Since the publication of Roy Andrew Miller's "Japanese and the Other Altaic Languages" in 1971, some also included Japanese (Nicholas Poppe) or Japonic, consisting of Japanese and Ryukyuan.
A few linguists (such as (Street 1962)) even count Ainu with the Altaic languages but as part of a node including Korean and Japanese, in contrast to a Turkic-Mongolic-Tungusic node, with Korean-Japanese-Ainu and Turkic-Mongolic-Tungusic, in turn, forming a higher-level node.
The core version of Altaic, consisting of Turkic, Mongolic, and Tungusic, is sometimes referred to as "Micro-Altaic," and the expanded version, including Korean and sometimes Japanese, is referred to as "Macro-Altaic," but even the core version is very controversial.