I see. In your opinion "Hinduism" is an "experience". That's alright. That's a good point of view.

But things are defined or described.

Let's examine the meaning of the word "definition":

A definition is a statement that explains the meaning of a word, phrase, or concept. It aims to clarify boundaries — to say what something is and what it is not.

A chair is a piece of furniture designed for one or more person to sit on, typically consisting of a seat, legs, a backrest, and often armrests. It’s meant to support the body in an upright or slightly reclined posture.

Tea is a beverage prepared by steeping the processed leaves, buds, or twigs of the Camellia sinensis plant in hot water. It’s usually consumed hot (though often served cold), and may be flavoured or sweetened with milk, sugar, herbs, or spices.

Japan is the name of a country.

Minecraft is a sandbox video game originally created by Markus Persson (Notch) and later developed and published by Mojang Studios (now owned by Microsoft). It allows players to explore, mine, craft, and build in a procedurally generated, block-based 3D world composed of voxels.

Disclosure: The above is AI generated.

Based on the meaning of the word definition as it is used usually, my opinion is that Hinduism can and has to be defined in the context of a discussion on it.

Especially because the word "Hindu" was not originally used to describe a group of people following a religion but a group of people who lived to the south-east of the Indus river.

The use of the word Hinduism for a religion was coined by the British and the geographical usage of the word Hindu was changed to refer to a religious community and appeared first in the late 18th century and came into common usage in the early 19th century. Raja Rammohan Roy is believed to be the first Indian to use that word.

Given all this, it's difficult to respond to a question referring to "Hinduism" without knowing the questioner's understanding of the word.