position 16 in a countable series of things
"The sixteenth car in the line was finally allowed to drive onto the highway."
one part in sixteen equal parts
"The recipe calls for a sixteenth of a cup of vanilla extract to balance the sweetness of the cake batter."
One of sixteen equal parts of a whole.
"She held up her hand to show that she had completed sixteenths of the marathon, leaving fourteen more miles to go."
The ordinal form of the number sixteen.
"The sixteenth song on the album is my favorite track so far."