Definition of pencil:
(n) :
a
paintbrush; writing utensil that uses
graphite (commonly referred to as
lead). Regular pencils usually have a graphite shaft surrounded by wood. A pencil sharpener is used to cut away the wood and leave a fine tip on the pencil. Also available in a
mechanical version where the graphite length can be adjusted and sharpening is not needed
(v) :
to squeeze something (meeting, feature, appointment, etc.) into a tight schedule; to
tentatively make a booking
"I am very busy today but I can pencil you in at 3 p.m."