Englishfor English speakers
initial
Adjective
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(span style="color:green"usually before the noun/span) The initial period, stages, etc. come near the beginning.
They send most workers to the US after an initial training period of three months.
With these cars, the initial cost is high, but you save money in the long run.
My initial reaction when I saw the bear was to run and hide.
initial
Noun
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An initial is the first letter of a name.
He found a bag with the initials D.B.R.
His name is Daniel Jr., His initial is D.J.
initial
Verb
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If you initial something, you write the first letter of each of your names on it (or sometimes just your first and last name).
Can you initial this form here, please?
diagram
Noun
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A diagram is a drawing, or sketch, to show how something, such as a machine, works.
You can see from this diagram that the electric switch is very simple, in fact.
Here is a diagram of some machines in a power plant.