Rigor is something strict, severe or demanding. 1  Harsh and strict treatment in the military for cadets is an example of rigor. 2  Freezing weather and ice are examples of the rigors of winter.  Difficult and challenging academic courses are an example of academic rigor.
The suffix gram means to draw or write. This is used in telegram.
What exactly is a gram? Technically a gram is âthe absolute weight of a volume of pure water equal to the cube of the hundredth part of a metre, and at the temperature of melting ice.â Please do not remember that last sentence.