Thai has a similar word, อุดมคติ (read "udomkhati"), which seems to have the same meaning, judging from the meaning you give in the question.
The best English word for it for all intents and purposes is ideal.
Here is its definition by Oxford Dictionaries:
Pronunciation: /ʌɪˈdɪəl/, /ʌɪˈdiːəl/
1. Satisfying one’s conception of what is perfect; most suitable
2. [attributive] Existing only in the imagination; desirable or perfect but not likely to become a reality
1. A person or thing regarded as perfect
1.1. A standard or principle to be aimed at