Definition
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réasún
Is é réasún an fáth a bhfuil rud éigin á dhéanamh, a dhéanann ciall le gníomhaíocht nó le cinneadh.
A reason is the cause for which something is done, making sense of an action or decision.
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Ní raibh aon réasún leis an gcinneadh a rinne sé.
There was no reason for the decision he made.
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Caithfidh tú réasún maith a thabhairt dom chun an t-am sin a chailleadh.
You need to give me a good reason for missing that time.
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Is é an réasún atá taobh thiar den athrú seo ná an t-éileamh a mhéadú.
The reason behind this change is to increase demand.