Ad hoc and Present-day

Ad hoc adjective - Made or done without previous thought or preparation.

Present-day and ad hoc are semantically related In some cases you can use "Present-day" instead an adjective phrase "Ad hoc".

Present-day adjective - Being or involving the latest methods, concepts, information, or styles.

Ad hoc and present-day are semantically related in present topic. Sometimes you can use "Ad hoc" instead an adjective phrase "Present-day".