Rapidity

Something else to be borne in mind here is the rapidity with which the virus can reproduce.

Source: tatoeba (61856)

I was pleased with the rapidity with which he mastered Japanese.

Source: tatoeba (283538)

Rapidity of rise may be inversely proportional to duration at altitude.

Source: tatoeba (2042067)

There is a revolution coming. It will not be like revolutions of the past. It will originate with the individual and with culture, and it will change the political structure only as its final act. It will not require violence to succeed, and it cannot be successfully resisted by violence. It is now spreading with amazing rapidity, and already our laws, institutions and social structure are changing in consequence. It promises a higher reason, a more human community, and a new and liberated individual. Its ultimate creation will be a new and enduring wholeness and beauty — a renewed relationship of man to himself, to other men, to society, to nature, and to the land. This is the revolution of the new generation.

Source: tatoeba (6211476)