Denshi Jisho — Online Japanese dictionary

くびき yoke
Noun 
こうき scale; balance; weighing machine
Noun 
こうへい balance; equity
Noun, Na-adjective 
平法 こうへいほう equity (in law)
Noun 

You can also

Look up kanji details for 衡.

Try a Yahoo Jisho search for 衡 .
Try a Goo Jisho search for 衡 .
Try a Google search for 衡 .