| Subject | English | Japanese |
| obs. | exp having an ideal | あんべし |
| obs. | exp having an ideal | あべし |
| gen. | n yoji an ideal topography for the four Taoist gods, with a river in the east, a broad avenue in the west, a basin in the south, and a hill in the north | 四神相応 |
| gen. | exp v5u being ideal | 三拍子そろう |
| gen. | exp v5u being ideal | 三拍子揃う |
| pow.el. | controlled ideal no-load direct voltage | 理想制御無負荷直流電圧 |
| phys. | homogeneous ideal | 同次イデアル (dōji-idearu) |
| gen. | ideal absorbed solution theory | IAS理論 |
| el. | ideal amplifier | 理想増幅器 |
| el. | ideal attenuator | 理想減衰器 |
| el. | ideal capacitor | 理想コンデンサ |
| el. | ideal capacitor | 理想キャパシタ |
| construct. | ideal city | 理想都市 (りそう・とし) |
| semicond. | ideal crystal | 完全結晶 (かんぜん・けっしょう) |
| phys. | ideal crystal | 理想結晶 (りそう・けっしょう) |
| el. | ideal current source | 理想電流源 |
| radio | ideal dielectric | 理想誘電体 |
| radio | ideal dielectric | 完全誘電体 |
| el. | ideal diode | 理想ダイオード |
| phys. | ideal elasticity | 理想弾性 (りそう・だんせい) |
| el. | ideal filter | 理想フィルタ |
| phys. | ideal fluid | 理想流法 (りそう・りゅうたい) |
| gen. | ideal fluid | 完全流体 (kanzen-ryūtai) |
| gen. | ideal fluid | 理想流体 (risō-ryūtai) |
| gen. | ideal fracture strength | 理想的破壊強度 |
| gen. | n ideal gas | 完全気体 (kanzen-kitai) |
| tech. | ideal gas | 完全ガス (kanzen-gasu) |
| gen. | n ideal gas | 理想気体 (risō-kitai) |
| phys. | ideal gas mixture | 理想混合気体 (りそう・こんごう・きたい) |
| phys. | ideal gas mixture | 混合理想気体 (こんごう・りそう・きたい) |
| el. | ideal gyrator | 理想ジャイレータ |
| el. | ideal impedance convertor | 理想インピーダンス変換器 |
| el. | ideal impedance convertor | 理想インピーダンスコンバータ |
| math. | ideal in a ring | イデ・アル (i.e. subset of a ring closed under addition and multiplication by elements of the ambient ring) |
| math. | ideal in a ring | イデアル (i.e. subset of a ring closed under addition and multiplication by elements of the ambient ring, idearu) |
| el. | ideal inductor | 理想インダクタ |
| telegr. | ideal instant | 理想的瞬間 |
| gen. | ideal irrigation interval | 理想的間断日数 |
| gen. | n ideal land | 華胥 |
| gen. | n ideal land | 理想郷 news2 nf41 |
| phys. | ideal lattice | 理想格子 (りそう・こうし) |
| construct. | ideal liquid | 理想液体 (りそう・えきたい) |
| snd.rec. | ideal magnetic medium | 理想磁気媒体 |
| gen. | ideal mixing | 理想混合 |
| vac.tub. | ideal noise diode | 理想雑音ダイオード |
| pow.el. | ideal no-load direct voltage | 理想無負荷直流電圧 |
| tech. | ideal refrigerating cycle | 理想冷凍サイクル (りそうれいとうサイクル) |
| tech. | ideal refrigerator | 理想冷凍機 (りそうれいとうき) |
| snd.rec. | ideal reproducing head | 理想再生ヘッド |
| el. | ideal resistor | 理想抵抗 |
| el. | ideal self-excitation | 理想的自己励磁 |
| gen. | ideal settling basin | 理想的沈澱池 |
| gen. | ideal settling basin | 理想的水平流沈殿池 |
| gen. | ideal slip strength | 理想的すべり強度 |
| gen. | ideal solution | 理想溶液 (risō-yōeki) |
| gen. | n ideal speaker-hearer | 理想的な言語使用者 |
| el.mot. | ideal synchronizing | 理想同期化 |
| phys. | ideal system | 理想系 (りそうけい) |
| phys. | ideal temperature | 理想温度 (りそう・おんど) |
| el. | ideal tension source | 理想電圧源 |
| gen. | n ideal time | 好期 |
| snd.rec. | ideal transducer | 理想トランスデューサ |
| el. | ideal transformer | 理想変圧器 |
| phys. | ideal transformer | 理想変成器 (risō-henseiki) |
| gen. | n ideal type | 理念型 |
| gen. | n ideal type | 理想型 |
| gen. | n ideal universal ruler | 転輪聖王 (in Indian religions) |
| gen. | n ideal universal ruler | 転輪王 (in Indian religions) |
| phys. | ideal vacuum | 理想真空 (りそう・しんくう) |
| el. | ideal voltage source | 理想電圧源 |
| gen. | n-suf ideal weather | 日和 ateji (for some action, event, etc.) |
| gen. | n yoji ideal weather for a walk | 散歩日和 |
| gen. | n yoji ideal weather for an outing | 行楽日和 |
| phys. | maximal ideal | 極大イデアル (kyokudai-idearu) |
| phys. | primary ideal | 準素イデアル (junso-idearu) |
| math. | n prime ideal | 素イデアル (so-idearu) |
| gen. | n principal ideal | 主イデアル (shu-idearu) |
| phys. | principal ideal ring | 主イデアル環 (shu-idearu-kan) |
| gen. | n yoji the ideal conditions for reading | 読書三余 |
| rel., budd. | n wheel-shaped treasure possessed by the ideal universal ruler, carried in front of him during excursions to allow easy passage | 輪寶 oK |
| rel., budd. | n wheel-shaped treasure possessed by the ideal universal ruler, carried in front of him during excursions to allow easy passage | 輪宝 |