The repetative behaviours refer to things such as headbanging, flapping arms, clapping hands, rocking ect. Things that the person does very often without even knowing they are doing it, or as a form of expression. The interests refer to how people with autism can be "obsessive" about certain items/topics. For example my son likes spinning wheels on toy cars, and has an obsession with times and dates.
Repetitive behavior refers to actions or movements that are repeated over and over again, often without a clear purpose. These behaviors can be seen in various conditions such as autism spectrum disorder, obsessive-compulsive disorder, and certain neurological conditions. Efforts to reduce or manage repetitive behaviors often involve behavioral interventions or medication.
Repetitive
Loud and sustained or repetitive noise.
repetitive tasks
RSI stands for, Repetitive Strain Injury.
Human behaviour that is like an exploding bomb, or about a person whose behaviour is like this.
Interests.
I think you mean hi-hats.
Some people mean the same thing when they talk about repetitive strain injuries and repetitive motion injuries. The difference is most likely that RSIs are from abusing a part of your body by working it improperly while a RMI is just from regular use.
It does not mean a thing. Dreams are produced by the subconscious mind of each individual, and are as unique as each individual. Generally speaking, repetitive dreams indicate an issue the dreamer has not resolved. So not having repetitive dreams might suggest that this dreamer is conscientious about dealing with problems as they arise. Or it could mean this dreamer simply does not remember many dreams.
Erratic or unpredictable in behaviour or direction
guided by whim, sudden moods of behaviour