The phrase "second slot" refers to the position or place that comes right after the first one. It can be used to describe the second option, choice, or opportunity in a sequence or order. Full definition
Networks designate a particular 30 second slot as «addressable», meaning ads can be swapped in and out, then download a collection of ads to your box in advance. (newscientist.com)
Amazon, together with all the other moneyed outfits gearing up for an appearance during the Super Bowl breaks, will be spending around $ 15 million for its 90 - second slot on Sunday. (digitaltrends.com)
It has hybrid dual Nano SIM slots of which second slot doubles for MicroSD card. (techandroids.com)