Preferences in the use of overabundance: predictors of lexical bias in Estonian

This study of morphological overabundance focuses on the (non-)synonymy of parallel forms in Estonian illative case (‘into’) and the type of entrenchment behind it. We focus on the lexical level, testing whether the form preferred for a lexeme depends on semantic or morphophonological factors, or both. Using multifactorial regression analyses, we compare three corpus datasets: lexemes biased toward long forms, those biased toward short forms and lexemes with balanced form distribution. This is the first study to investigate realised overabundance in this way, and to include inflection class membership in the model, enabling us to test whether declension class subsumes the morphophonological factors found to affect form preference in previous studies. The analysis shows that cell token frequency and inflection class are significant predictors of form preference, while the lexical-semantic features included in the study do not affect formative choice, highlighting the role of cell entrenchment instead of formative entrenchment in guiding form use. In conclusion, the study highlights the important role of inflection class (morphophonology) in the general shaping of form usage patterns in parallel forms and the weak role of semantic factors on the lexical level.