A selection of ‘Carnival’ definitions found online:

 

Oxford:

An annual festival, typically during the week before Lent in Roman Catholic countries, involving processions, music, dancing, and the use of masquerade.

 

Cambridge:

(a special occasion or period of) public enjoyment and entertainment involving wearing unusual clothesdancing, and eating and drinking, usually held in the streets of a city:

 

Collins:

A carnival is a public festival during which people play music and sometimes dance in the streets.

A carnival is a travelling show which is held in a park or field and at which there are machines to ride on, entertainments, and games.

A carnival of something such as colours or sounds is a bright or exciting mixture of them.

 

Miriam Webster:

1: a season or festival of merrymaking before Lent

2a: an instance of merrymaking, feasting, or masquerading

b: an instance of riotous excess, a carnival of violence

3a: a traveling enterprise offering amusements

b: an organized program of entertainment or exhibition

 

Dictionary.com:

A traveling amusement show, having sideshows, rides, etc.

Any merrymaking, revelry, or festival, as a program of sports or entertainment

The season immediately preceding Lent, often observed with merrymaking; Shrovetide

 

 The Free Dictionary:

  1. often Carnival The period of merrymaking and feasting celebrated just before Lent.
  2. A traveling amusement show usually including rides, games, and sideshows.
  3. A festival or revel: winter carnival.

 

Oxford Learner Dictionary:

​A public festival, usually one that happens at a regular time each year, that involves music and dancing in the streets, for which people wear brightly coloured clothes

 

Vocabulary.com:

 a traveling show; having sideshows and rides and games of skill etc.

a festival marked by merrymaking and processions

 a frenetic disorganized (and often comic) disturbance suggestive of a large public entertainment