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Not a + noun

“Not a + noun” is used for strong emphasis. It means “not even one” or “not a single.”

Here are 5 short examples, with 10 sentences in total:

Not a word did he say.

→ He did not say even one word.

Not a single student was absent.

→ Every student was present.

Not a sound was heard.

→ There was complete silence.

Not a drop of water remained.

→ There was no water left at all.

Not a moment was wasted.

→ No time was wasted.

Not a soul was seen in the street.

→ Nobody was seen in the street.

Not a trace of fear did she show.

→ She showed absolutely no fear.

Not a complaint was received.

→ No complaints were received.

Not a single mistake was found.

→ No mistakes were found at all.

Not a glimmer of hope remained.

→ There was absolutely no hope left.

Key idea

Not a + noun = not even one / not a single + noun

Compare:

A sound was heard. → One sound was heard.

Not a sound was heard. → No sound at all was heard.

And when it begins the sentence, it can create strong focus, especially in formal or literary English:

Not a word did he say.

The normal word order would be:

He did not say a word.

The first version is more emphatic.