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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.

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.

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).