1. (adjective) (of e.g. a molecule) made reactive or more reactive

• excited

1. (adjective) (of sewage) treated with aeration and bacteria to aid decomposition

• treated

2. (adjective) (of e.g. a molecule) made reactive or more reactive

• reactive

3. (adjective) rendered active; e.g. rendered radioactive or luminescent or photosensitive or conductive

• active

4. (adjective) (military) set up and placed on active assignment

• active

1. (adjective) (of e.g. a molecule) made reactive or more reactive

• natural philosophy
• physics

2. (adjective) (military) set up and placed on active assignment

• armed forces
• armed services
• military
• military machine
• war machine