reduction
/rɪˈdʌkʃən/noun
mass noun
1
- the action or fact of making a specified thing smaller or less in amount, degree, or size缩减, 降低：
talks on arms reduction
削减武器谈判
count noun there had been a reduction in the number of casualties.伤亡人数已经减少。
1.1
- count noun the amount by which something is made smaller, less, or lower in price（数量的）削减; （价格的）降低：
special reductions on knitwear.
针织品特价。
1.2
- the simplification of a subject or problem to a particular form in presentation or analysis归纳, 简化：
the reduction of classical genetics to molecular biology.
将古典遗传学归结为分子生物学。
1.3
- Mathematics the process of converting an amount from one denomination to a smaller one, or of bringing down a fraction to its lowest terms【数】简化, 缩减, 约化; 归约。
1.4
- Biology the halving of the number of chromosomes per cell that occurs at one of the two anaphases of meiosis【生】染色体减半。
2
- count noun a thing that is made smaller or less in size or amount, in particular规模（或数量）被减少之物, 尤指：
2.1
- an arrangement of an orchestral score for piano or for a smaller group of performers简编曲（管弦乐改编的钢琴曲或小乐队演奏曲）。
2.2
- a thick and concentrated liquid or sauce made by boiling浓汤, 浓汁。
2.3
- a copy of a picture or photograph made on a smaller scale than the original（照片, 画）缩小版。
3
- the action of remedying a dislocation or fracture by returning the affected part of the body to its normal position脱臼（或断骨）复位。
4
- Chemistry the process or result of reducing or being reduced【化】还原; 被还原。
5
- Phonetics substitution of a sound which requires less muscular effort to articulate【语音】弱化：
the process of vowel reduction.
元音弱化。
词源
late Middle English (denoting the action of bringing back)： from Old French, or from Latin reductio（n-）, from reducere 'bring back, restore' （see REDUCE）. The sense development was broadly similar to that of REDUCE; sense 1 dates from the late 17th cent.