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on one occasion only
happening only once, or existing only in one place
something that is unrepeatable can only be done once or not very often because it is very special
a once in a lifetime experience is very unusual or special
with one sudden action, or on one single occasion
happening or done once and not repeated
used for emphasizing that this is the only time that something will happen
in an online conversation, repeatedly asking a person questions which suggest that you are interested in what they are talking about, but are actually intended to annoy them
an experienced person who helps someone who has less experience, especially in their job
an electric skateboard
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Free thesaurus definition of happening only once from the Macmillan English Dictionary - a free English dictionary online with thesaurus and with pronunciation from Macmillan Publishers Limited.