a.

1. 活躍的；活潑的
   Mrs. Brown is over 80 and not very active now.

   布朗太太已八十多歲，現在不大活動了。

2. 積極的；勤奮的
   He became an active social reformer.

   他成了一位積極的社會改革家。

3. 在活動中的；在進展中的
   Mount Vesuvius is an active volcano.

   維蘇威是一座活火山。

4. 現役的
5. 現行的，有效的
   an active law

   現行法律

6. 【文】主動的[Z]
   the active voice

   主動語態

n.

1. 積極分子[C]
2. 【文】主動語態[U]

adj.

1. moving or tending to move about vigorously or frequently.
   ▸(of a person's mind or imagination) alert and lively.
2. participating in a particular sphere or activity.
3. working or in operation.
4. Grammar  denoting a voice of verbs in which the subject is typically the person or thing performing the action and which can take a direct object (e.g. she loved him as opposed to he was loved). The opposite of passive.
5. (of a volcano) erupting or having erupted in historical times.
6. (of a disease) not in remission or latent.
7. having a chemical or biological effect on something.
8. (of an electric circuit) capable of modifying its state or characteristics automatically in response to input or feedback.

n.