'fragment of a second' is not correct and is not usable in written English.
There are other ways to express the idea of a fraction of a second in written English. For example: "In the blink of an eye" or "in a split second".
Microexpressions reveal someone's true feelings in a fragment of a second, and so it pays to notice them and calibrate your behavior in cross-cultural interactions accordingly.
The blast of giddy mania that burst from Centre Court at 5.25pm on Sunday, sweeping across the nation through living rooms, pubs and sunlit gardens, hit the steep patch of grass above the All England Club's biggest screen like a shockwave a fragment of a second after Novak Djokovic's backhand cannoned into the net.
A fragment of a second-century floor mosaic that sat in storage for nearly 80 years now holds a place of honor in the Groos Family Atrium in Klarman Hall.
One is a fragment of a third-century tombstone, found at a Roman site and engraved with a woman's name: "Matrona, daughter of Rabbi Judah Noah".
But here's a discovery worth reporting: the engineer Paul Green, Jr., and his nephew, the pianist Frederick Moyer, have uncovered a fragment of a Fourth Piano Sonata by Robert Schumann.
It could be a Zen koan, or a fragment of a Fifth Dimension lyric: The value of music is what the listener will pay.
Sarasota County, one of four (plus a fragment of a fifth) that make up the district, had an abnormally high rate of "undervotes" in the race.
From the Larsson aficionado's point of view, the quarrel matters because the writer – who planned 10 books in all – left a 200-page fragment of a fourth Millennium volume behind at his death.
The intern will study and transcribe two unpublished early music manuscripts, now in the collection of I Tatti's Morrill Music Library: one a fragment of a thirteenth-century liturgical manuscript with musical notations, and the other a seventeenth-century collection of songs and arias.
It's possible that a similar reassessment may be in store for this month's entry in the "lost gospel" genre, a fragment of a fourth-century transcription of a late-second century Gnostic text that contains a line in which Jesus seems to refer to Mary Magdalene as his wife.
Scholarly discussion over the papyrus — which contains the phrase "Jesus said to them, 'My wife...'... " — has been intense since a Harvard scholar, Karen L. King, presented it as a fragment of a fourth-century gospel at an international conference of Coptic scholars this month in Rome.
