(figuratively, by extension) An impediment that prohibits the use, adoption, application, etc. of (something).

A harbor, airport, or border crossing where goods or immigrants enter a country. / The location or mechanism by which a foreign entity gains entry into the body or self.

plural of port of entry

Reverse culture shock.

A record book in which all transactions (or all of a certain class) of a business are recorded and from entries are made in accounting records such as the general ledger or subsidiary ledgers.

Synonym of book of original entry (“kind of record book in accounting”)

plural of book of prime entry

plural of book of original entry

(automotive) A type of extended-Brayton-cycle-based two-stroke engine which uses four cylinders for a combustion cycle of four strokes, but having a power stroke rate of that on regular two-stroke cycles.

plural of entry point for the eye