Here are all the possible meanings and translations of the word almeida, portugal. Freebase(0.00 / 0 votes)Rate this definition: Almeida, Portugal. Almeida is a town and municipality in Portugal with a total area of 518 kmÂ² and a total population of 7,784 inhabitants. Located in Riba-CÃ´a river valley, Almeida is an historic town in Beira Interior. there are several castles in the municipality: Castelo Bom, Almeida and Castelo Melhor.