vt.

1. 矫正；改正
   The tardiness in the investigation of the money laundering scandal is a situation that must be rectified immediately.

   查洗钱案的速度太慢是必须立即改正的状况。

2. 【电】整（流）
3. 【化】精馏
4. 【数】求（曲线）的长度

v.

1. put right; correct.
2. convert (alternating current) to direct current.
3. Mathematics  find a straight line equal in length to (a curve).