Correct
四声
/ sìshēng /
Strokes
Definition
the four tones of Middle Chinese: level tone 平声, rising tone 上声, departing tone 去声 and entering tone 入声/the four tones of Modern Standard Mandarin
Example
As a Noun
four tones in classical Chinese pronunciation ［i.e. level tone（平声），rising tone（上声），falling tone（去声）and entering tone（入声）］
As a Noun
four tones in modern standard Chinese pronunciation ［i.e. high and level tone（阴平），rising tone（阳平），falling-rising tone（上声）and falling tone（去声）］
As a Noun
tones (in broad sense)