1. having received instruction or practice to develop a skill
2. having been taught to behave in a particular way

1. past tense and past participle of train

Examples

• She is a trained nurse with ten years of experience.
• The trained dog sat quietly beside its owner.
• He trained for months before running the marathon.
• The company hired only trained professionals.
• The circus animals were well trained to perform tricks.
• She trained her voice by practicing scales daily.
• The soldiers were trained in combat techniques.