A particular moment, as in At no point in time had they decided to leave the country, or The exact point in time when he died has not been determined. Critics say this usage is wordy since in most cases either point or time will suffice. However, it has survived since the mid-1700s. Also see at this point.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.