Can someone me figure out the definition of the bold words?

All of the terms are explained in the pictures.

The last two terms are written in the explanation section.

Explanation:

Tachycardia -- it is a condition that is connected to the activity of heart where a normal heart rate is in disorder and the heart is beating faster in the state of resting.

It's normal that heart beats are faster when a person is exercising or during some other activities, or some traumas and illness.

This condition can lead to heart attack, stroke or heart failure.

Fission -- is a noun in English language and it represents the act of splitting something or dividing it in two or more parts.

It comes from Latin language, from the verb FINDERE ( to split ) --> fissio -- > fission ( English language, 17th century )

idk im sorry well i am new at this so im trying

he believed if we do not fight back the britins would be in every household