Wiktionary
n. one and a half part of anything that may be divide, or considered as divided. num. (translation only)
Wikipedia
One and a Half is a Train EP ( extended play) that was released in very limited numbers in 1999. It was recorded and released between the Train and Drops of Jupiter albums.
The EP included some new never-before-released tracks such as "Counting on You", "Sweet Rain", "The Highway", an acoustic version of Train's hit single "Meet Virginia" from their 1998 self-titled debut, and an acoustic cover of Led Zeppelin's "Ramble On".
Usage examples of "one and a half".
Two men, a hamper, and three oars immediately left the boat on the larboard side, and reclined on the bank, and one and a half moments afterwards, two other men disembarked from the starboard, and sat down among boat-hooks and sails and carpet-bags and bottles.
It then took gentle hold of the radio operator and lowered the one and a half tons carefully into its back, which was usually reserved for gravel or sand which it dug from the quarries.
She glanced at the time, she was due there in one and a half Earth standard hours.
She traced a panel, about one and a half meters square, set flush with the hull.
It is a clear and deep green well, half a mile long and a mile and three quarters in circumference, and contains about sixty-one and a half acres.
The 'Turtle' hung suspended in the energetic repulsion shock field, which held it continuously one and a half to two-feet off the ground.