SentiWordNet is a lexical resource for opinion mining. SentiWordNet assigns to each synset of WordNet three sentiment scores: positivity, negativity, objectivity. SentiWordNet is described in details in the papers:

 SentiWordNet: A Publicly Available Lexical Resource for Opinion Mining
 SentiWordNet 3.0: An Enhanced Lexical Resource for Sentiment Analysis and Opinion Mining

How to obtain SentiWordNet

The current "official" version of SentiWordNet is 3.0, which is based on WordNet 3.0.
Click here to fill the request form for SentiWordnet 3.0

SentiWordNet has been used in...

Check Google for a list of the papers that use SentiWordNet 3.0

Check Google for a list of the papers that use SentiWordNet 1.0

User feedback

The SentiWordNet interface now provides the possibily to accept user feedback on the values assigned to synsets.

This feature is a first step towards building a community of SentiWordNet users that collaboratively improve SentiWordNet.

Feedback log packets

Any feedback collected from the community will be shared to the public domain through this site, i.e., what comes from the community goes back to the community.

Feedback log packets will be released periodically on this site.

The feedback process is currently anonymous, the IP and time of the feedback action is recorded only for the purpose of spam filtering, the feedback log packets will not contain the IP address.

Improving SentiWordNet with feedback

The feedback currently does not directly affect SentiWordNet values, we (Baccianella, Esuli, Sebastiani) manually check it in order to correct SentiWordNet values.

Sample terms:
 good  bad  best  worst  short  long  ill  healthy

Sample code

Here you can find a simple java class that uses SentiWordNet to approximate the sentiment value of a word with a label.

P.S. Note that in this piece of code there is no word sense disambiguation and the scores are approximated with labels, so it's very basic.

News

28/05/2010
The new SentiWordNet site has been launched!
Check out the new Feedback button in the search page!

In order to obtain a copy of SentiWordNet you must fill out the form below and agree with the license terms described in the text that follows.

This license allows you to use SentiWordNet only for research, non-profit purposes. Any institution, be it academic or non-academic, is allowed to use SentiWordNet for any non-profit research project. It is important for us to have feedback on research projects involving SentiWordNet: we kindly ask you to provide us with references to published papers where the use of SentiWordNet is discussed, and to give us comments and feedback.

Publications or presentations containing research results obtained through the use of SentiWordNet should cite the following reference:

For all projects of a commercial nature, an application should be made for a commercial license for evaluation purposes, internal use, or re-selling. For more information, please contact Fabrizio Sebastiani ( fabrizio . sebastiani @ isti . cnr . it).

The current version of SentiWordNet is 3.0.


You can obtain a research license by filling the following online form. Please give us clear evidence about your affiliation (for instance the e-mail account or home-page). If you are an undergraduate or master student the license should be submitted by a professor of your University.
See above for commercial licenses.

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Note: we use the email domain as the first criterium for determining if the request comes from an academic source (entitled to use SentiWordNet for free for research purposes), or not. Any request from generic email addresses (e.g. gmail, hotmail, yahoo, 126.com) will be rejected.

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Please read and accept the following agreement terms (by clicking the accept button at the end of the agreement):

Agreement terms:

LICENSE AGREEMENT

Istituto di Scienza e Tecnologie dell'Informazione - Consiglio Nazionale delle Ricerche (ISTI-CNR)

SentiWordNet (Database)

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    The Istituto di Scienza e Tecnologie dell'Informazione - Consiglio Nazionale delle Ricerche (ISTI-CNR) hereby grants you a non-exclusive, non-transferable, perpetual, royalty-free and worldwide license (the "License") to use the SentiWordNet data file (the "Database") solely for educational and research purposes, in accordance with Paragraph 2 below and subject to the terms and conditions of this License Agreement (the "Agreement").

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    You agree to acknowledge ISTI-CNR by citing the following publication in any publication or presentation containing research results obtained in whole or in part through the use of the Database:

      Andrea Esuli and Fabrizio Sebastiani. SentiWordNet: A Publicly Available Lexical Resource for Opinion Mining. In Proceedings of LREC-06, 5th Conference on Language Resources and Evaluation, Genova, IT, 2006, pp. 417-422.

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