Noun
Verb (する, transitive)
1. fixing (in place); being fixed (in place); securing; anchoring; fastening down
2. fixing (e.g. salary, capital); keeping the same
3. fixation (histology)
Noun
Internet slang
Abbreviation
4. user name (on an online forum like 2ch where the majority of users post anonymously)
5. user of an online handle (instead of posting anonymously)