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n.
(chemistry) the three traditional states of matter are solids (fixed shape and volume) and liquids (fixed volume and shaped by the container) and gases (filling the container); "the solid state of water is called ice"
n.
a situation from which extrication is difficult especially an unpleasant or trying one; "finds himself in a most awkward predicament"; "the woeful plight of homeless people"
v.
furnish with a preface or introduction; "She always precedes her lectures with a joke"; "He prefaced his lecture with a critical remark about the institution"