- (algebra) The lowest upper bound, an operation between pairs of elements in a lattice, denoted by the symbol ∨.
- (computing, databases) An intersection of data in two or more database tables.
- An intersection of piping or wiring; an interconnect.
- To accept, or engage in, as a contest.
- To combine more than one item into one; to put together.
"The plumber joined the two ends of the broken pipe."
- To become a member of.
"Many children join a sports club."
- (obsolete, rare) To enjoin upon; to command.
- To come into the company of.
"I will join you watching the football game as soon as I have finished my work."
- To unite in marriage.
- To come together; to meet.
"Parallel lines never join."
- (computing, databases, transitive) To produce an intersection of data in two or more database tables.
"By joining the Customer table on the Product table, we can show each customer's name alongside the products they have ordered."