(UK, aviation, travel) A free (or low cost) trip for travel agents or consultants, provided by a travel operator or airline as a means of promoting their service.

A book containing line art for readers (usually children) to add color using crayons, colored pencils, markers, paint, or other artistic media.

Enough or more than enough.

(organic chemistry) Any of several polycyclic hydrocarbons whose cagelike structure resembles part of the diamond crystal lattice.