A fragment is a small piece that’s come off a larger whole, and to fragment is to break. If your teacher writes "frag" on your paper, you've got an incomplete sentence.

Fragment, meaning "a tiny, brittle shard," first appeared as a noun and later as a verb. That afternoon you hacked away at the fireplace in your parents’ living room in search of secret treasure as a child? Those dusty chunks of brick you scattered all over their shag carpet were fragments of a once-intact wall, and a happier time before you were grounded. Not only did you cause physical damage that day, but you also fragmented their trust in you.

Definitions of fragment
  1. noun
    a piece broken off or cut off of something else
    “a fragment of rock”
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    bit, chip, flake, fleck, scrap
    a small fragment of something broken off from the whole
    a fragment of brick used as a weapon
    cinder, clinker
    a fragment of incombustible matter left after a wood or coal or charcoal fire
    (geology) a constituent fragment of a clastic rock
    coal, ember
    a hot fragment of wood or coal that is left from a fire and is glowing or smoldering
    a fragment rubbed off by the use of a file
    paring, shaving, sliver
    a thin fragment or slice (especially of wood) that has been shaved from something
    restriction fragment
    the fragment of DNA that is produced by cleaving DNA with a restriction enzyme
    (usually plural) a fragment scraped off of something and collected
    spall, spawl
    a fragment broken off from the edge or face of stone or ore and having at least one thin edge
    a small fragment of a burning substance thrown out by burning material or by friction
    fragments of wood
    metal filing
    a fragment of metal rubbed off by the use of a file
    exfoliation, scale, scurf
    a thin flake of dead epidermis shed from the surface of the skin
    (botany) a covering that resembles scales or bran that covers some plant parts
    a thin sliver of wood
    sliver, splinter
    a small thin sharp bit of wood or glass or metal
    a shaving created when something is produced by turning it on a lathe
    type of:
    part, piece
    a portion of a natural object
  2. noun
    a broken piece of a brittle artifact
    synonyms: shard, sherd
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    a shard of pottery
    type of:
    a separate part of a whole
  3. noun
    an incomplete piece
    fragments of a play”
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    bit, snatch
    a small fragment
    type of:
    an artistic or literary composition
  4. noun
    an incomplete sentence with the punctuation and capitalization of a complete sentence
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    type of:
    a string of words satisfying the grammatical rules of a language
  5. verb
    break or cause to break into pieces
    “The plate fragmented
    synonyms: break up, fragmentise, fragmentize
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    atomise, atomize
    break up into small particles
    bray, comminute, crunch, grind, mash
    reduce to small pieces or particles by pounding or abrading
    break down and crush by beating, as with a pestle
    break apart or in two, using violence
    sliver, splinter
    break up into splinters or slivers
    break into lumps before sorting
    break into crumbs
    break into breccia
    break into small pieces
    grate, grind
    make a grating or grinding sound by rubbing together
    grind together, of teeth
    reduce to pulp
    grind, mash or pulverize in a mortar
    grind with a mill
    break up into small pieces for food preparation
    chew, jaw, manducate, masticate
    chew (food); to bite and grind with the teeth
    type of:
    break, come apart, fall apart, separate, split up
    become separated into pieces or fragments
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