Okay, this is going to be long. Because no word is in itself, but rather all words are interconnected as an understanding for those humans, who have the cognition to do so.
But there are several ways to do that understanding and this post in one, but not the only way to do.
Using analytical and phenomenological philosophy integrating in effect biology and more broadly cause and effect, I can make the following model of the universe where the model is a part of the universe and not independent of the universe.
The universe is assumed to be real, orderly and knowable, but not objective or subjective as only the one or the other.
Rather if I say I know something I account for all 3 parts of I know something.
So how does that work for objective and subjective if I include cause and effect and biology?
Well, first version for the 5 senses as objective:
2a: of, relating to, or being an object, phenomenon, or condition in the realm of sensible experience independent of individual thought and perceptible by all observers : having reality independent of the mind.
expressing or dealing with facts or conditions as perceived without distortion by personal feelings, prejudices, or interpretations; limited to choices of fixed alternatives and reducing subjective factors to a minimum… See the full definition
www.merriam-webster.com
So something objective is an experience not caused by the brain, but coming to the brain/mind. I will add biology more in depth latter.
Then there is the other version of objective, which is not objective as the first version but rather non-objective in the above sense.
1a: expressing or dealing with facts or conditions as perceived without distortion by personal feelings, prejudices, or interpretations. Again MW.
Notice express or deal. Those are active human behaviors, they cause something and they require a brain. They are not independent of the brain/mind.
Then there are the standard ones for subjective, again subjective as per MW.
3a: characteristic of or belonging to reality as perceived rather than as independent of mind : PHENOMENAL compare OBJECTIVE sense 2a
b: relating to or being experience or knowledge as conditioned by personal mental characteristics or states
4a(1): peculiar to a particular individual : PERSONAL
(2): modified or affected by personal views, experience, or background
b: arising from conditions within the brain or sense organs and not directly caused by external stimuli
c: arising out of or identified by means of one's perception of one's own states and processes
And now comes the joke for cause and effect. If all causes are objective as independent for brains/minds then they, brains/minds, can't work, because they can't cause any behavior, but they do. You are reading the result of one such case right now.
So the biology part of the replication of the fittest genes and the organism, who do that.
In a proto sense all life is subjective as all processes are in the organism and not independent of the organism.
Now here are the 4 classes of behavior for life in general for which only humans match all 4.
-"Automated" behavior.
-Behavior learned to testing out the behavior, e.g. higher motor skills.
-Behavior learned by mimicking and then internalizing the behavior.
-Behavior using abstract signs learned by internalizing the behavior as meaning and understanding.
And now comes the joke of Western culture. Objectivity is so useful to what we do, that some of us have learned the folk belief that everything can be done objectively, because objectivity is better than subjectivity.
Well, no. Everything is not objective. Rather if something is subjective, then someone can claim it is objective and get away with that, because they can do it subjectively. But I can catch that for my model and do it differently.
So this model is a model in the landscape of both the model and landscape as parts of the same.
So now feelings about independent. I hate that word in philosophy as the folk dualism of objective reality is independent of the brain/mind as really independent, because it end up being impossible to explain for cause and effect.
But in the broad sense it is the same dualism some people use for objective and subjective.
So back to I know something. I can know something is subjective and I describe it as subjective as I. I just have to understand that I am describing a relationship in 3 parts: I know something and some of it is objective in relationship to my mind, but not independent in toto.