Please don’t just paste the definition from the dictionary. I’ve looked through several dictionaries and I still don’t understand this word fully. All I am getting is ” act of manifesting” “something that manifests” etc… I don’t know what “manifest” is?

I know you said that you already looked at dictionary listings, but really, that’s the way to go. If you don’t know what a word means that is given in a definition, keep looking the words up–which is what I easily did and put the answer to your question below (you just needed to go an extra step)

Manifestation:
1. an act of manifesting.
2. the state of being manifested.
3. outward or perceptible indication; materialization. Ex: At first there was no manifestation of the disease.
4. a public demonstration, as for political effect.
5. Spiritualism. a materialization.

Manifest:
1. To show or demonstrate plainly; reveal. Ex: “Mercedes . . . manifested the chaotic abandonment of hysteria” (Jack London).
2. To be evidence of; prove.
3. 1. To record in a ship’s manifest.
2. To display or present a manifest of (cargo).