ADJ.
new
VERB + HALF-HOURLY
take
HALF-HOURLY + NOUN
stratford
PREP.
between
adj
Once every half-hour, every 30 minutes.
a half-hourly train service
A new half-hourly service between Stratford [Greater London] and Meridian Water was introduced on 9 September by Greater Anglia.
adv
At intervals of a half-hour, every 30 minutes.
Take this medicine half-hourly.