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.
In the examples weâve shown so far, the âgramsâ part of ân-gramsâ could be taken to mean âwordâ, but that doesnât necessarily have to be the case. For example, in DNA sequencing, âgramsâ could mean one character in a base-pair sequence.