CPA - Cost per Acquisition: The amount you are willing to pay for a conversion. How much you pay when a consumer makes a purchase, fills out a lead, or any other action that you value on your site.

CPC - Cost per Click: The amount you pay for a click on your ad. How much you pay each time someone clicks to get to your site.

CPV - Cost per Value: Custom bidding for the keyword and match type, which is based on a percentage of revenues or profit, not a fixed amount. Dynamic value per conversion.

CTR - Click through Rate: The number of clicks your ad receives divided by the number of times your ad is shown. The number of clicks to your site per the number of impressions.

Conversion delays: The delay that occurs when Google AdWords is integrated with Google Analytics. When you integrate Google Analytics conversion tracking with Google AdWords, it takes two to three days for conversions to show in AdWords while costs and other activity are recorded within three hours.

Volume elasticity: An increase in your target cost that leads to an increase in volume.
For example, if you change what you are willing to pay for a conversion by one dollar, how many more conversions will you get due to a better position and increased traffic.