sinmortigo

How the word is built. Sinmortigo decodes in three steps, and every piece is one the course has already taught. Sin is si, the reflexive pronoun, in the accusative: oneself, as the object of a verb. Mortigi is to kill, itself morti plus the causative -ig-, so literally to cause to die. The -o makes a noun of the whole thing. The killing of oneself. The reflexive article covers why sin and not si here: the pronoun is the object, so it takes -n.

Register. This is the clinical and factual term. It is the word used in a medical record, in a statistic, in a news report and in a public health document, and that is why it appears on a frequency list at all. The verb is sinmortigi and a person who has died this way is a sinmortiginto. Older texts sometimes use memmortigo, with mem (self) in place of sin; the two mean the same thing.

A note on saying it. Health bodies advise against phrasings that treat the act as a crime or an achievement, and Esperanto lets you avoid both without effort, because sinmortigo carries no such freight. Use the plain noun.

If you are thinking about suicide, please talk to someone: a kuracisto, a helpline, or a person you trust.