An "outlier year" refers to a year that is significantly different or exceptional compared to others. It stands out because it deviates from the norm or usual pattern, either in a positive or negative way. Full definition
Rather than try to go for broke in the early years, consider building your foundation so that you can take greater risk in outlier years when you do have the safety of an established business to fall back on. (inc.com)
In fact, in 2007 in Science we noted the rapid warming during 1990 - 2006, naming as the first reason «intrinsic variability within the climate system» — which is also the prime reason for the slower warming trend when looking at the period starting in the hot outlier year 1998. (shapingtomorrowsworld.org)
Still, there are a few rare outliers each year, and this year is no exception — thanks mostly to Wonder Woman. (vanityfair.com)