• его судят заочно – he is being tried in absentia
• учиться заочно – study by correspondence
• голосовать заочно – vote by absentee ballot
См. также: заочное заседание, заочное образование, заочный, заочный курс
In absentia is usually a legal way to describe someone as being absent, especially during a courtroom trial that the defendant doesn't attend. A judge or lawyer might say, "He is being tried in absentia." (Vocabulary.com)
If the general meeting/quotaholders' meeting is held by correspondence, then at least eight days must be provided to the shareholders/quotaholders to provide their votes in writing. (Thomson Reuters Practical Law)
