One way to picture it: someone (or something) whose ability lines up exactly with what the task demands — enough to meet the mark, not more.
From the word’s history
Latin competō meant 'to coincide, to be equal to' — literally com- ('together') + petō ('seek, aim at'), two things aiming at the same point and meeting there. That meeting-of-two-things is still what the modern word measures: your ability meeting the standard.
拉丁文 competō 的意思是「相合、相當」，拆開來是 com-（一起）+ petō（趨向、瞄準）——兩個東西朝同一點靠過去，最後接上了。這個「兩邊對得上」的畫面一直留到今天：competent 量的正是你的能力和標準有沒有接上。也因為它原本就是「相當」而不是「超越」，所以現代英文裡它常常只到剛好而已。
Wiktionary 'competent' etymology (Middle English < Old French competent < Latin competēns, participle of competō 'coincide, be equal to')
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原始詞典資料6 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
competentadj/ˈkɒmpətənt/
- 1
Having sufficient skill, knowledge, ability, or qualifications.
- He is a competent skier and an expert snowboarder.
- I believe in that myself because it has been explained by competent men as the convolutions of the grey matter.
- 2
lawHaving jurisdiction or authority over a particular issue or question.
- For any disagreements arising from this contract, the competent court shall be the Springfield Circuit Court.
- judicial authority having competent jurisdiction
- 3
Adequate for the purpose.
- For if they [birds] had been Viviparous, the burthen of their womb, if they had brought forth any competent number at a time, had been ſo big and heavy, that their wings would have failed them, and ſo every body would have had the wit to catch the Old one.
- 4
biologymedicinenatural-sciencesFunctionally in order; functioning adequately.
- a competent sphincter; a competent cervix; a competent immune system
- 5
biologynatural-sciencesPermeable to foreign DNA.
- 6
geographygeologynatural-sciencesResistant to deformation or flow.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。