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observer
observingly
obsess
obsession
obsessive
obsessive-compulsive
obsessive-compulsive disorder
obsidian
obsolesce
obsolescent
obsolete
obstacle
obstacle course
obstacle race
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obsolesce

ob·so·lesce [ òbssə léss ] (past and past participle ob·so·lesced, present participle ob·so·lesc·ing, 3rd person present singular ob·so·lesc·es)


intransitive verb 
Definition:
 
become obsolete: to become obsolete

[Late 19th century. < Latin obsolescere (see obsolescent)]
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