'aport' originates from Middle English, specifically from the phrase 'a port' (from the prefix 'a-' + 'port'), where the prefix 'a-' meant 'on/to' and 'port' (from Old French and Latin 'portus') meant 'harbor' or 'port'.

'aport' changed from the Middle English phrase 'a port' or expressions like 'at port' and eventually became the modern English word 'aport'.

Initially, it meant 'at or toward the port/harbor', and over time it narrowed to the nautical sense 'on or toward the port side of a ship'.