Definition of «to mark this milestone»

The phrase "to mark this milestone" means to recognize or celebrate an important achievement or event.

With this particular purchase I didn't so much buy a print of a drawing from an artist as mark a milestone in my life. (rockstarboss.com)
Today marks a milestone for me as a person and as a writer. (massimomarinoauthor.com)
I am looking forward to helping to mark the milestone with a conversation about non-traditional roles and new perspectives on African American art. (culturetype.com)
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