定期定額 Dollar cost averaging

[wiki] Dollar cost averaging
http://en.wikipedia.org/wiki/Dollar_cost_averaging

Dollar cost averaging is also called DCA and constant dollar plan in the US, pound-cost averaging in the UK, and by the currency-neutral terms unit cost averaging and cost average effect

定時定額申購　Dollar-cost averaging
http://fund.bot.com.tw/z/glossary/glexp_4448.asp.htm

etrade叫Automatic Investment Plan (AIP)
https://us.etrade.com/e/t/pict/automaticinvestment#
firstrade叫Periodic Investment Plan (PIP)
http://www.firstrade.com/public/en_us/productsservices/investmentchoices/mutualfunds/