Combined Use, Serving Two Purposes
noun, の adjective, verbal noun
If you concurrently use one thing for multiple purposes, you're using something with a combined use. Something that is serving two purposes.
けんよう
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
この食事は朝昼兼用にします。
I’d call this meal brunch.