line

a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning

“I can't follow your line of reasoning”

make a mark or lines on a surface

“draw a line”

a means of communication or access

“lines of communication were set up between the two firms”

the descendants of one individual

“his entire lineage has been warriors”

space for one line of print (one column wide and 1/14 inch deep) used to measure advertising

a short personal letter

“drop me a line when you get there”

a telephone connection

be in line with; form a line along

“trees line the riverbank”

the maximum credit that a customer is allowed

a particular kind of product or merchandise

“a nice line of shoes”

a pipe used to transport liquids or gases

“a pipeline runs from the wells to the seaport”

a slight depression or fold in the smoothness of a surface

“his face has many lines”