(*) Indicates that the word or term is now obsolete or obsolescent.
A.I. 1 Aberration
A.I. Classification symbol denoting character of a vessel well constructed and efficiently equipped—letter referring to her construction, figure denoting equipment. A numeral, not exceeding 100, is usually prefixed to vessels built of iron or steel; some vessels built for special trades or purposes may not have the numeral. Roughly speaking, the numeral can be looked upon as a percentage of perfection.
A. When applied to a temperature, denotes that it has been measured from Absolute zero and is expressed in Centigrade or Celsius units.
Abaca. Philippine plant, of plantain genus, from which manilla hemp is made.
Aback. Said of a sail when the wind is on the fore side of it.
Abaft. On the after side of. Further towards the stern.
Abandonment. Surrender of an insured vessel and of all claims to ownership. Made by owners to underwriters when vessel is a constructive total loss and insurance is to be paid.