Esse is the verb "to be". Only nouns are declined, therefore it is in no declension.
Third declension.
'Tempus' is third declension.
First declension.
The Latin noun Homo, hominis is in the third declension.
Third declension.
The infinitive "to be," in latin is esse.
to be - esse
to be - esse
esse aut non esse
Consul, consulis is third declension.
Latin word for being is "esse".
esse