MDBG Mobile Chinese English Dictionary (iPhone, Android, Windows Phone)

比	bǐ	to compare / (followed by a noun and adjective) more {adj.} than {noun} / ratio / to gesture / (Taiwan pr. [bi4] in some compounds derived from Classical Chinese)
派	pài	clique / school / group / faction / to dispatch / to send / to assign / to appoint / pi (Greek letter Ππ) / the circular ratio pi = 3.1415926 / (loanword) pie
对比	duì bǐ	to contrast / contrast / ratio / CL:个
性价比	xìng jià bǐ	cost-performance ratio
比值	bǐ zhí	ratio
比率	bǐ lǜ	ratio; rate; proportion
系数	xì shù	coefficient / factor / modulus / ratio
比价	bǐ jià	to compare prices; to compare offers / price ratio; price parity; rate of exchange
反比	fǎn bǐ	inversely proportional / inverse ratio
正比	zhèng bǐ	direct ratio / directly proportional
连比	lián bǐ	compound ratio
复比	fù bǐ	compound ratio (i.e. the product of two or more ratios)
轴率	zhóu lǜ	axial ratio
信噪比	xìn zào bǐ	signal-to-noise ratio
屏占比	píng zhàn bǐ	screen-to-body ratio (of a smartphone etc)
传动比	chuán dòng bǐ	transmission ratio / gear ratio
性别比	xìng bié bǐ	sex ratio
圆周率	yuán zhōu lǜ	(math.) the ratio of the circumference of a circle to its diameter (π)
共模抑制比	gòng mó yì zhì bǐ	(electronics) common-mode rejection ratio (CMRR)
压缩比	yā suō bǐ	compression ratio