The phrase "second anniversary" refers to the celebration of an event or occasion that has happened for the second time, usually occurring once a year. Full definition
I was happy to add a little sparkle to celebrate This Season's Gold second anniversary and all that is to come our way this year! (thisseasonsgold.com)
The award, presented on the thirty - second anniversary of Blair Peach's death, goes to Jason Hill, the president of the NUT's Stoke - on - Trent division. (politics.co.uk)
Running a Household Celebrates Second Anniversary (susanshain.com)