post, pillar, stone; see sign 1.
discovery, breakthrough, anniversary; see event 1, 2.
"milestone." YourDictionary, n.d. Web. 19 July 2019. <https://thesaurus.yourdictionary.com/Milestone>.
milestone. (n.d.). Retrieved July 19th, 2019, from https://thesaurus.yourdictionary.com/Milestone
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