A tagset is a list of part-of-speech tags (POS tags for short), i.e. labels used to indicate the part of speech and sometimes also other grammatical categories (case, tense etc.) of each token in a text corpus.

Italian TreeTagger part-of-speech tagset is available in Italian corpora annotated by the tool TreeTagger that was developed by Helmut Schmid in the TC project at the Institute for Computational Linguistics of the University of Stuttgart and using Marco Baroni’s parameter file.

An Example of a tag in the CQL concordance search box: [tag=”ADJ”] searches all adjectives, e.g. forte (note: please make sure that you use straight double quotation marks)

Tagset

ADJ adjective
ADV adverb (excluding -mente forms)
ADV:mente adveb ending in -mente
ART article
ARTPRE preposition + article
AUX:fin finite form of auxiliary
AUX:fin:cli finite form of auxiliary with clitic
AUX:geru gerundive form of auxiliary
AUX:geru:cli gerundive form of auxiliary with clitic
AUX:infi infinitival form of auxiliary
AUX:infi:cli infinitival form of auxiliary with clitic
AUX:ppast past participle of auxiliary
AUX:ppre present participle of auxiliary
CHE che
CLI clitic
CON conjunction
DET:demo demonstrative determiner
DET:indef indefinite determiner
DET:num numeral determiner
DET:poss possessive determiner
DET:wh wh determiner
NEG negation
NOCAT non-linguistic element
NOUN noun
NPR proper noun
NUM number
PRE preposition
PRO:demo demonstrative pronoun
PRO:indef indefinite pronoun
PRO:num numeral pronoun
PRO:pers personal pronoun
PRO:poss possessive pronoun
PUN non-sentence-final punctuation mark
SENT sentence-final punctuation mark
VER2:fin finite form of modal/causal verb
VER2:fin:cli finite form of modal/causal verb with clitic
VER2:geru gerundive form of modal/causal verb
VER2:geru:cli gerundive form of modal/causal verb with clitic
VER2:infi infinitival form of modal/causal verb
VER2:infi:cli infinitival form of modal/causal verb with clitic
VER2:ppast past participle of modal/causal verb
VER2:ppre present participle of modal/causal verb
VER:fin finite form of verb
VER:fin:cli finite form of verb with clitic
VER:geru gerundive form of verb
VER:geru:cli gerundive form of verb with clitic
VER:infi infinitival form of verb
VER:infi:cli infinitival form of verb with clitic
VER:ppast past participle of verb
VER:ppast:cli past participle of verb with clitic
VER:ppre present participle of verb
WH wh word

Source: http://sslmit.unibo.it/~baroni/collocazioni/itwac.tagset.txt