register tonnage: meaning, definition, pronunciation and examples
C2technical / formal
Quick answer
What does “register tonnage” mean?
A measure of a ship's internal volume used to calculate official port fees, taxes, and manning requirements.
Audio
Pronunciation
Definition
Meaning and Definition
A measure of a ship's internal volume used to calculate official port fees, taxes, and manning requirements.
It refers specifically to the legally certified total enclosed volume of a merchant ship, expressed in register tons (where one register ton equals 100 cubic feet). It is a key figure in a vessel's official documents, distinct from its weight-carrying capacity.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. 'Register tonnage' is a standardized international maritime term.
Connotations
Technical, official, regulatory. Connotes legal documentation and compliance.
Frequency
Used exclusively in the shipping, maritime law, and naval architecture domains. Extremely rare outside these fields in both the UK and US.
Grammar
How to Use “register tonnage” in a Sentence
The [ship/vessel] has a gross register tonnage of [number].[Regulation/Fee] is based on the vessel's net register tonnage.Vocabulary
Collocations
Examples
Examples of “register tonnage” in a Sentence
verb
British English
- The ship was registered as having a tonnage of 15,000.
American English
- The vessel will be registered with a net tonnage below the threshold.
adjective
British English
- The register-tonnage figures were submitted to the maritime authority.
American English
- A register-tonnage certificate is required for admission to the port.
Usage
Meaning in Context
Business
Used in shipping contracts, insurance underwriting, and port tariff calculations.
Academic
Found in maritime history, naval architecture, and international maritime law texts.
Everyday
Virtually never used in everyday conversation.
Technical
The primary context: ship registration, classification society rules, and International Maritime Organization (IMO) conventions.
Vocabulary
Synonyms of “register tonnage”
Strong
Neutral
Weak
Vocabulary
Antonyms of “register tonnage”
Watch out
Common Mistakes When Using “register tonnage”
- Using 'register tonnage' to refer to the weight of cargo a ship can carry (which is deadweight tonnage).
- Confusing 'gross register tonnage' with 'gross tonnage' (GT), the latter being a newer, different formula.
- Pronouncing 'register' with the stress on the first syllable (/ˈredʒ.ɪ.stə/) in this compound; it typically retains the stress pattern of the verb (/ˌredʒ.ɪ.stə/).
FAQ
Frequently Asked Questions
No, it's a common misconception. 'Register tonnage' measures the ship's internal volume in units of 100 cubic feet, not its weight. Weight is measured as displacement or deadweight tonnage.
Gross Register Tonnage (GRT) is the total enclosed volume of the ship. Net Register Tonnage (NRT) is the GRT minus the volume of spaces not used for cargo (like engine rooms, crew quarters). NRT represents the revenue-earning space.
For ships built after 1982, the International Tonnage Convention (ITC) replaced GRT/NRT with 'Gross Tonnage (GT)' and 'Net Tonnage (NT)'. However, 'register tonnage' remains relevant for older ships and in historical or legal contexts.
It is a key legal and commercial metric. It determines port dues, pilotage fees, registration taxes, safety rules (like the number of lifeboats required), and manning regulations under many maritime laws.
A measure of a ship's internal volume used to calculate official port fees, taxes, and manning requirements.
Register tonnage: in British English it is pronounced /ˌredʒ.ɪ.stə ˈtʌn.ɪdʒ/, and in American English it is pronounced /ˈredʒ.ɪ.stɚ ˈtʌn.ɪdʒ/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “None”
Learning
Memory Aids
Mnemonic
Think of a ship's 'register' (its official logbook) where its 'tonnage' (size based on volume) is recorded. The 'register' determines the 'tonnage' for the register.
Conceptual Metaphor
The ship's internal size as a 'taxable space' or a 'legal footprint' on the water.
Practice
Quiz
What does 'register tonnage' specifically measure?