There is no such things called spirits and if u see "things" ask a doctor
You continue to make it repeatedly, with measurements of several kinds if possible, and you enlist the help of several others to make the same observation repeatedly and with measurements.
Some people believe that spirit guides and angels are one in the same but others do not feel that they are. There is no definitive proof one way or another.
In Yoruba culture, an abiku is a spirit child believed to be predisposed to die young and repeatedly come back to the same family. The child's death is believed to be caused by the spirit's desire to return to the spirit world. Rituals and precautions are often performed by the family to prevent the child from dying again.
An obanje is a term used in Igbo culture to describe a malevolent spirit or reincarnating being that is believed to repeatedly die and be reborn within the same family. It is often associated with bringing misfortune and death to its family members.
Yes a soul is the same thing as a ghost and spirit. Once a human is dead their sole becomes alive which makes a Spirit and because a ghost and spirit are the same thing, a soul is the same as a ghost and spirit.
repeated addition or multiplication
Nagging, repeatedly complaining about the same thing.
Saying the same thing repeatedly.
Wasps come back to the same place repeatedly because they are territorial and have a strong memory of locations where they have found food or suitable nesting sites.
Successful
Scalar multiplication.
If you visit somewhere you go there in person. Thus if you "visit repeatedly" you are going to the same place over and over again.