"'Intonation,' in music, is a musician's realization of pitch accuracy, or the pitch accuracy of a musical instrument. Intonation may be flat, sharp, or both, successively or simultaneously."

https://en.wikipedia.org/wiki/Intonation_(music)#Interval.2C_melody.2C_and_harmony

Example: "His voice was gloriously clear, and his intonation was perfect."

Also, A4 has not always been pitched at 440Hz. During the Baroque period, for instance, it was pitched at 415Hz. Many modern Baroque ensembles use A4 at 415Hz in their performances. Here is an interesting article on its long history:

https://medium.com/classical-music-education/tuning-temperaments-a4-440-435-430-5-415hz-by-roel-hollander-c45d8f9e2dd5#.ujt6qzhxe

"'Intonation,' in music, is a musician's realization of pitch accuracy, or the pitch accuracy of a musical instrument. Intonation may be flat, sharp, or both, successively or simultaneously."

https://en.wikipedia.org/wiki/Intonation_(music)#Interval.2C_melody.2C_and_harmony

Example: "His voice was gloriously clear, and his intonation was perfect."

Also, A4 has not always been pitched at 440Hz. During the Baroque period, for instance, it was pitched at 415Hz. Many modern Baroque ensembles use A4 at 415Hz in their performances. Here is an interesting article on its long history:

https://medium.com/classical-music-education/tuning-temperaments-a4-440-435-430-5-415hz-by-roel-hollander-c45d8f9e2dd5#.ujt6qzhxe

Used as an adjective: intonational.

http://www.wordhippo.com/what-is/the-adjective-for/intonation.html