This is the 16497th most frequent Turkish word.
yaşanmamıştı
"Had not been experienced"
The word 'yaşanmamıştı' in this sentence is used as a verb in the third-person singular past tense, indicating that the event ('heat records') had not taken place in the past.
Bu yaz, daha önce hiç yaşanmamıştı böyle sıcaklık rekorları.
This summer, such heat records had never been experienced before.
Here, 'yaşanmamıştı' conveys that such achievements were rare and had not been experienced in historical context.
Onun yaptığı büyük başarılar, tarihte kolay kolay yaşanmamıştı.
The great achievements he made had rarely been experienced in history.
In this sentence, 'yaşanmamıştı' describes that the specific moment had never been felt or encountered in the past.