Frequency is simply "how often a repeating thing happens per unit of time."
# of events per unit of time.
Commonly measured in Hertz = # of events per second.
Period.
It's a property of electromagnetic waves, the rate at which a piston fires in a car engine, sound waves....anything with something that happens over and over.
I just like word roots when it helps figure out some aspect of the word's meaning.
Example: A plant genus, pachyphytum.
Pachy - "Ok, that's probably something in common with elephants."
Pachy = thick, or large
Pachyderm = thick skin
Pachyphytum --> thick plant
It's nice when there's at least some part of a language that sort of makes a little bit of something resembling sense.
(Sort of - it's based on Greek words, possibly with some Latin swirled in, and spelled incorrectly. If our language was alive, it would try to beg for death, but its hideous, partially-undead gurgles would be incomprehensible.)
Horror - horrible - horrific
Terror - terrible - terrific?

:thumbsup:
Flammable = Inflammable
Nonflammable --> Noninflammable?
Inflamed = Either it's on fire, or it's swollen
Calculus = High-level math, or an abnormal mineral deposit in your body
Lumen = A measure of light emitted by something, or the internal cavity of a tube in the body, such as an artery
Electron spin = A property of electrons that has nothing to do with spinning
I'll go back on my previous statement - if the language was assembled into a life form, it would be a large middle finger.