Englishfor English speakers
mobility
Noun
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Mobility is the ability to move or be moved freely and easily.
threshold
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noun
the starting point for a new state or experience
on the threshold of manhood
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noun
the smallest detectable sensation
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noun
(= doorsill)
the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway
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noun
(= doorway, door)
the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close
he stuck his head in the doorway
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noun
(= brink)
a region marking a boundary