Someone recently came to my blog with the following query: one year relation call anniversary, what do call two years relationship?
The search result brought them to my blog post on what to call monthly anniversaries, but I thought I’d take a moment to directly answer the question.
As the reader correctly pointed out, one uses the word anniversary to refer to the passing of the first year of a relationship. However, anniversary can be used regardless of how many years you’ve been in the relationship—2 years, 10 years, 50 years; it doesn’t matter.
That being said, if you want to differentiate between a one-year relationship and a two-year relationship, then just refer to the two-year relationship as second anniversary. And likewise for subsequent years (3 years becomes third anniversary, 4 years becomes fourth anniversary, and so on).