A Wordnet from the Ground Up

2.5. The Final State of plWordNet Core 45A common practice in describing the size of a wordnet is to report the numberof synsets it contains. This practice can be traced back to the original concept of PWNaccording to which a wordnet is an inventory of senses expressed by synsets. In ourapproach, LUs are the centrepiece of the wordnet. For many wordnet applicationsthe numbers of lemmas (in the sense 11 introduced in Section 1.2) and the correspondingLUs (Section 2.1) are the most important characteristics of a lexical resource,representing its coverage and applicability. That is why we prefer to describe the sizeof the core plWordNet in lemmas and LUs, but for the sake of comparison we includethe number of synsets, by part of speech. See Table 2.1.Including Monosemous Lemmas Excluding Monosemous LemmasNouns 1.405 2.586Verbs 1.281 2.406Adjectives 1.472 2.754Table 2.2:Average polysemy in the core plWordNetAround half of the lemmas employed in the construction of the core plWordNetwere selected from the list of 10000 most frequent lemmas in IPIC. The remainder isdue to the linguists’ additions required to complete certain synsets, and to the attemptsto translate the upper levels of PWN’s hypernymy structure for the three parts of speech.Percentage of lemmas belonging to the n synsets [%]1 2 3 4 5 6 7 8 9 ≥ 10Nouns 74.46 16.15 5.92 2.17 0.74 0.36 0.15 0.05 0.00 0.00Verbs 80.04 14.21 4.17 0.99 0.40 0.19 0.00 0.00 0.00 0.00Adjectives 73.10 15.74 6.61 2.71 0.99 0.08 0.27 0.15 0.15 0.20Table 2.3:The number of synsets to which a lemma belongs in the core plWordNetPercentage of synsets including the n lexical units [%]1 2 3 4 5 6 7 8 9 ≥ 10Nouns 65.91 19.50 7.91 3.82 1.38 0.62 0.36 0.13 0.17 0.20Verbs 21.45 39.09 22.11 9.55 4.41 1.93 0.48 0.36 0.18 0.44Adjectives 56.67 23.65 11.71 3.87 2.29 0.61 0.61 0.23 0.14 0.22Table 2.4:Sizes of synsets in the core plWordNetThe division of lemmas into monosemous and polysemous, further illustrated in Table2.2, was inspired by a similar practice of PWN (Miller et al., 2007). The polysemystatistics illustrate the general character of lemmas included in the core.11 Technically, a lemma is the basic morphological form of a given word form, produced by morphosyntacticdisambiguation in context.