"Line acceleration" refers to the increase in speed or rate of movement along a straight line. It is the change in velocity in a straight path, becoming faster or slower. Full definition
«We plan to demonstrate our improved power and performance both in terms of straight line acceleration as well as road course handling and lap time performance». (hennesseyperformance.com)
These higher ratios net the GT a bit more straight - line acceleration at the expense of a few miles per gallon on the highway. (cnet.com)
More than once I surprised a few cars with quick off - the - line acceleration away from stop lights. (articles.orlandosentinel.com)