1 engrossed or absorbed in something, esp. one's own thoughts
2 already or previously occupied
3 (Biology) (of a taxonomic name) already used to designate a genus, species, etc.
English Collins Dictionary - English Definition & Thesaurus
absent-minded, absorbed, abstracted, caught up in, distracted, distrait, engrossed, faraway, heedless, immersed, in a brown study, intent, lost in, lost in thought, oblivious, rapt, taken up, unaware, wrapped up
English Collins Dictionary - English synonyms & Thesaurus
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