Abstract
The present research featured the definition of grammatical gender category as it was coined by Fernão’s de Oliveira (1507–1581), a prominent Portuguese linguist that wrote the first Grammar of the Portuguese Language (1536), where he outlaid the main principles of gender classification. The research was based on F. de Oliveira’s works, namely The Grammar of the Portuguese Language, The Art of Sea Warfare, The Voyage of Fernão de Magalhães, and The Book of Shipbuilding. The linguistic data were selected from the above-mentioned works based on linguistic criteria by the method of continuous sampling. The article also describes various gender definition methods, e.g. morphonology, morphology, anaphora, syntax, secondary morphologization, words of one flexion, and vocalic inflexion (alternation of open and closed, pure and nasal vowels). The analysis of Oliveira’s speculations on grammatical gender revealed that the Portuguese grammarian failed to cover the issues of Singularia / Pluralia tantum, grammatical doublets, toponyms, epicenes, possessive pronouns, and participles.

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