"In the context of 3GPP 5G standardization contributions, the term numerology refers to the configuration of waveform parameters, and different numerologies are

"In the context of 3GPP 5G standardization contributions, the term numerology refers to the configuration of waveform parameters, and different numerologies are considered as OFDM-based sub-frames having different parameters such as subcarrier spacing/symbol time, CP size, etc." (source: https://red-colmena.com/f/JyY1ajY1JmhhZSFpdC91JGcmIyEsYGU/18/08/cw_5g_training_v3_slides.pdf https://red-colmena.com/f/JyY1ajY1JmhhZSFpdC91JGcmIyEsYGU/18... which I found with a quick web search for "OFDM numerology")