לְהַגְדִּיר

To define something is to show what it is and what it isn’t, where it begins and where it ends. For example, בית house is a place of living, but it is not a workplace. 

The Hebrew word for to define is להגדיר , a הפעיל verb calling upon the root ג.ד.ר meaning fence: to define something is to put conceptual fences around it.

For example:

קשה לי להגדיר מה אני מרגיש. זה פחד? עצב? לא ברור.

It’s hard for me (a male) to define what I feel. Is it fear? Sadness? Unclear.

definition is הגדרה .