What is the Gaelic word for discipline?

There isn't one single perfect translation for "discipline" in Gaelic, as the best word depends on the context. The meaning could range from self-discipline to punishment to a branch of study.

Here are a few options, with nuances:

* `smachd` (Scottish Gaelic): This is probably the closest general equivalent, encompassing both the idea of control and punishment. It can refer to self-discipline, parental discipline, or even military discipline.

* `dearc` (Irish Gaelic): This translates more to "regard" or "respect," but in certain contexts, it could imply the discipline needed to show proper regard or respect.

* `caoi` (Irish Gaelic): This translates to "manner," "way," or "method." In a context referring to a disciplined approach to something, this could be appropriate.

To choose the most accurate translation, you'd need to specify how "discipline" is used in your sentence.