thresholds

'thresholds'

[threshold.n.01] as in: the starting point for a new state or experience

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Examples:
on the threshold of manhood

'thresholds'

[threshold.n.02] as in: the smallest detectable sensation

'thresholds'

[doorway.n.01] as in: the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close

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Examples:
he stuck his head in the doorway

'thresholds'

[doorsill.n.01] as in: 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

'thresholds'

[brink.n.01] as in: a region marking a boundary