I do not know the official definition of grounding but for me it's not exactly using 5 senses, for me using 5 senses are tools to ground myself but they don't mean grounding for me...

I understand grounding as, like mentioned above, being here and now but also to realize that for instance I'm getting more and more anxious while there is no a direct reason or to understand why I'm getting more and more anxious. It allows me to focus on my current tasks and makes feeling happy and calm I guess etc. But in three words I would just say: here and now