All 6 Uses

aqueduct
in
The Railway Children
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Look here, this is where the Aqueduct begins.'†
p. 71.6
The Romans were dead nuts on aqueducts.†
p. 72.1 *
And, remember, you aren't to worry about doctor's bills or you'll be ill yourself, and then I'll send you a bill as long as the aqueduct.'†
p. 72.4
'It was simply ripping, Mother,' said Peter, when they reached home very happy, very tired, and very dirty, 'right over that glorious aqueduct.†
p. 158.1
Meanwhile Peter had decided to flatten out all his forts and earthworks, with a view to making a model of the railway-tunnel, cutting, embankment, canal, aqueduct, bridges and all.†
p. 186.4
'It's not so dusty,' said Peter: 'look at the aqueduct straddling slap across the valley like a giant centipede, and then the town's church spires sticking up out of the trees like pens out of an inkstand.†
p. 209.6

Definitions:

(1) (aqueduct)
a structure built to carry large amounts of water over a distance
(2) (meaning too rare to warrant focus)