名詞 differential:

1. the result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx
   同義詞：derived function, derivative, differential coefficient, first derivative
2. a quality that differentiates between similar things
3. a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves
   同義詞：differential gear

形容詞 differential:

1. relating to or showing a difference
2. involving or containing one or more derivatives

1. An instrument that in a painless and noninvasive manner uses the differential transmission and reflection of ultrasonic waves to create a detailed visual image of the brain.
   超聲波心動描記器一種用來顯示詳細(xì)的大腦圖象的儀器，利用超聲波發(fā)送和反射的差異來測試并無傷無痛
2. Maximum price differential old new crops6% but protein content similar.
   新舊作物差價最高達6％, 但所含蛋白成份一樣。

dif.fer.en.tial

adj.（形容詞）
Of, relating to, or showing a difference.
差別的：差別的、關(guān)于或顯出差別的
Constituting or making a difference; distinctive.
區(qū)別的：構(gòu)成或制造差異；顯著
Dependent on or making use of a specific difference or distinction.
特異的：取決于或利用專門的特征或特性的
Mathematics Of or relating to differentiation.
【數(shù)學(xué)】 微分的：微分的、與微分學(xué)有關(guān)的
Involving differences in speed or direction of motion.
差動的：涉及速度或運動方向不同
n.（名詞）
Mathematics
【數(shù)學(xué)】
An infinitesimal increment in a variable.
變量無限小的增量
The product of the derivative of a function containing one variable multiplied by the increment of the independent variable.
微分：用獨立變量乘以含有一個度量的函數(shù)，然后對其求導(dǎo)所得的結(jié)果
Differential gear.
差動齒輪
A difference in wage rate or in price.
工資級差：工資或價格上的差異

【引伸】
dif.feren.tially
adv.（副詞）