What does «nono» mean in Spanish?

Ninth. Also used as a suffix.

Examples of use in Spanish: "el Papa Pío Nono".

"decimonono".
A period of time that, in ancient Rome, lasted from mid-afternoon to sunset.

Examples of use in Spanish: "en la Roma antigua la nona era la parte última del día, luego de la prima, la tercia y las vísperas".
fam. Grandfather or grandmother.

♦ Used in: Argentina - Chile - Peru - Uruguay - Venezuela

Examples of use in Spanish: "¿Viene el nono hoy a visitarnos?".
Sleep, sleepiness or desire to sleep.

♦ Used in: Argentina - Uruguay

Examples of use in Spanish: "-¿Vamos a hacer nono? -le dijo la madre a su pequeño hijo acostándolo en su cama".

"tengo nono -dijo el niño medio dormido".
(Nono) Small town located in the province of Córdoba (Argentina), 150 km from the city of Córdoba. The name comes from the Quechua "ñuñu", which means "woman's breasts", in reference to two hills in the area that resemble breasts.