A Part
Noun
いちよく
大きなプロジェクトの一翼を担えることになりました。
I’ll handle part of the big project.
If you only have one wing you only have part of a bird. Or a plane. Either way, you only have a part of it.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.