ideal
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adjective
1. satisfying one's conception of what is perfect; most suitable:
«…にとって» 理想的な, 最適な, 申し分ない «for»
e.g. the swimming pool is ideal for a quick dip
e.g. this is an ideal opportunity to save money.
2. attributive existing only in the imagination; desirable or perfect but not likely to become a reality:
〖名詞の前で〗(理想を満たす)想像上の, 空想上の〈世界･社会･仕事など〉; 非現実的な〈計画など〉(↔ real, actual)
e.g. in an ideal world, we might have made a different decision.
representing an abstract or hypothetical optimum:
e.g. mathematical modeling can determine theoretically ideal conditions.
noun
a person or thing regarded as perfect:
〖単数形で; しばしばone's ～〗 理想的な人, 物; 典型, 模範
e.g. you're my ideal of how a man should be.
a standard of perfection; a principle to be aimed at:
(原理･見解などの)理想
e.g. tolerance and freedom, the liberal ideals.
ORIGIN
late Middle English (as a term in Platonic philosophy, in the sense ‘existing as an archetype’): from late Latin idealis, from Latin idea (see idea).