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Answer for the clue "Sign covering letter for foreign president ", 6 letters:
macron

Alternative clues for the word macron

Word definitions for macron in dictionaries

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"short horizontal line placed over a vowel to indicate length," 1827, from Greek makron , neuter of makros "long" (see macro -).

Wikipedia Word definitions in Wikipedia
In physics , the term macron is used to describe microscopic particles, dust sized, accelerated to high speeds. The term was first used in the late 1960s, when it was believed that macrons could be accelerated cheaply in small particle accelerators as a ...

WordNet Word definitions in WordNet
n. a diacritical mark (-) placed above a vowel to indicate a long sound

Usage examples of macron.

The macron orbiting here must be at right angles to the galactic rotation, and not circular at all.

In addition, the text contains two instances of a single m with a macron over it, signifying a double m.

What was the distinction between the tame macrons and the wild ones, that only the tame should pass?

And finally the light struck out into deep space, leaving its macrons behind, divorced.

Note: In this e-text, characters with macrons are preceded by an equal sign and enclosed in brackets, e.

Hannibal entered the country of the Ligurian tribes, who had lately declared in his favor, and descended by the valley of the Macra into the marshes on the banks of the Arno.

In the sources, macrons are normally used instead: We have already quoted alk-w&UnknownEntity.

When they heard of the battle which had taken place near the Aous, the Aetolians ravaged the country nearest to them round Sperchiae, and Macra Come, as it is called, and then crossing the frontiers of Thessaly they gained possession of Cymene and Angea at the first assault.

The truth is, the macrons are far more specific than light, because they don't diffuse readily or suffer such embarrassments as red shift.

The farther away the star we're looking at, the older it is, because of the time it takes our macrons to get here.

We find the macrons in a beam emanating from a thousand light-years away to be almost as distinct as those from our own sun's field.

At some point there will be an interaction that occurs in light—and some of the resultant macrons will reach us, however far away we are.

Does it hit the smarty sooner than the marginal one, or is it like the macrons: you get it or you don't?

The computer, he thought, must perform a tremendous task, for surely a completely different flow of macrons would be required for each change in direction—yet the transition was smooth.

What was the distinction between the tame macrons and the wild ones, that only the tame should pass?