Uncertain. Perhaps: * From Proto-Indo-European *sekʷ- (“to follow”), the same root of sequor. Properly, following, later in rank or order, i. e. less than something mentioned before. * Others refer it to Proto-Indo-European *swe- + *-ḱʷo-.
Oefen met het spreken en memoriseren van " secus " en vele andere woorden en zinnen in Latijn .