Homologous chromosome
Homologous chromosomes are chromosomes which have the same genetic Loci. However, they may or may not have two different alleles (version of genes) where one allele derives from a maternal chromosome whereas the other one is from a paternal chromosome.
Reference: Hartl, D.L., Jones, E.W. (2009) Genetics: Analysis of Genes and Genomes, United States of America: Jones and Bartlet