DIAN-3

('dian' in the third tone)

点 = point

一点 = yi(1)dian(4) = a moment

点什么 = dian(3)shen(2)me = something (in structures like 'buy something')

But:

我要问你一下 =  Wo(3) yao(4) wen(4) ni(3) yi(1) xia(4) = I want to ask you something

点击 = dian(3)ji(1) = to click (a term used almost exclusively for computer interfaces)

点击 = dian(3)ji(1) to click (computer and Internet jargon)

请输您的密码并点击'OK'. = Qing(3) schu(1)ru(4) nin(2)de(-) mi(4)ma(3)

bing(4) dian(3)ji(1) 'OK'. = Please enter your password and click 'OK'.