Yes it can be difficult for a learner to guess the meaning and usage from dictionary definitions.

In addition to what @Jenna showed you.

The simplest way to use the word sentiment as an opinion, to match the dictionary definition is to use this phrase.

"Yes I share the same sentiment"

"My sentiments exactly" = very common.

"Do you share the same sentiment/s" = can be feelings or opinions, depends on context.

A sentiment, can be a feeling or an emotional reaction or just an opinion.

In daly speaking the common way for someone to use "sentiment" --> to equal 'opinion', or to signal "agreement" is to respond with "My sentiments exactly" = you totally agree have same feelings and opinion.

It is a little rare and unusual to say "I am of the sentiment' that ->' your opinion' . Although you can do that. The usual way is to phrase it like this.

"I am of the opinion that ---> 'your opinion'.

Most often we use it in the phrase "share the same sentiment." It can be good or bad.

<em>I was very happy about the game, but he did not share the same sentiment.</em>

<em>I looked at her and saw her cry. In that moment, I knew we shared the same sentiment.</em>

<em>He thought it was funny. I did not share the same sentiment.</em>

We also use it a lot to refer to someone's expression towards our situation.

<em>He said he felt bad for me. I appreciated the sentiment.</em>

<em>My mom says she is excited. I know she is not actually excited, but I still appreciate the sentiment.</em>

Here are some more examples of other uses. It is quite "literary" and not very commonly used.

<em>Her poem was amazing. It held a beautiful sentiment.</em>

<em>She said that man is a hero because he is a soldier. It was an interesting sentiment, considering she hates war and violence.</em>

The adjective "sentimental" is also good to know. I think it is a little more common than "sentiment."

<em>The movie made her sentimental.</em>

<em>The ice cream gave me sentimental feelings.</em>

<em>He started crying when the puppy found a new home. I didn't know he was so sentimental.</em>

@John

That makes sense. Thank you very much for your kind help. 🤗😆

@Jenna

Thank you a lot for your sincerely help! 🤗

I guess it is used as opinion, which more likes an emotional tendency. Am I right or wrong?🤔😅