Science dealing with the emergence and evolution of life in the Universe — on Earth and beyond appears under different names in subject literature, these names are usually either a portmanteau of biology and astronomy, or involve particular branches of natural sciences. Scientific and linguistic methodology reveals the danger of gross oversimplification when using names such as: exobiology, cosmobiology, biocosmology, bioastronomy, as- trobiology, etc. The main purpose of this article is to present and analyse the relationships of such notations and synonyms, which are often used interchangeably, and to criticize the attempts of unifying these terms, and to characterize them in a linguistic context. On such basis, it shall be argued that the origin of the existing confusion and misunderstandings might have been either scientific or non-scientific imprecision which may be eliminated for the purpose of a better scientific communication and clarification of terminology as shown in this paper.
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