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define

/dɪˈfaɪn/
VCE 📚 1212 3 四级 六级 考研
If you define something, you show, describe, or state clearly what it is and what its limits are, or what it is like. 给…下定义; 解释

verb [vt. 及物动词] 给…下定义,解释;阐明,使清楚;标明…界限,明确显出…轮廓;是…的特征,为…的特色

The Convention Against Torture defines torture as any act that inflicts severe pain or suffering, physical or mental. 《反酷刑条约》把酷刑定义为任何造成严重身心疼痛和受苦的行为。

de + fin(界限, 范围) + e → 划定界限 → 下定义; 限定
单词造句:
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The term 'mental illness' is difficult to define. “精神病”这个词很难下定义。
We need to define the task ahead very clearly. 我们需要明确今后的任务。
It depends on how you define the term 'hostile'. 那得看你怎么定义hostile这个词。