I believe intrinsic impedance is more tied to the medium, thus is defined in terms of magnetic and electric permeability and electrical conductivity, while characteristic impedance is a "wider" look at the impedance. For example, you can calculate the intrinsic impedance of a 18 awg copper wire, or air, or a vacuum. If you wanted to use coax cable with an 18 awg core, you would be looking at the characteristic impedance, not the intrinsic impedance of the copper that will be carrying the waveform.
YES
db gain is defined as power gain, not voltage gain. Please restate you question in terms of power, or provide details of input and output impedance.
The differences between organisms is called Variation.
A polynomial is several terms added together.
Races or breeds are two terms for this.
The website Difference Between discusses on their website a number of different terms and objects. Site visitors can find various information regarding differences between objects and terms.
These are called the second differences. If they are all the same (non-zero) then the original sequence is a quadratic.
Neat, clean and tidy in basic terms are synonyms. For the specific differences between them, see the links.
In terms of function, nothing. The adult kidney is just much larger.
Essentially the two terms are synonymous, although termination DOES sound slightly more civilized.
The input selection control term may vary from television to television. This is why ProFun provides several terms for this.