partially open; ajar / (mathematics) (referring to an interval on the real line) containing only one of its endpoints

plural of half-sister

Barely awake.

Alternative spelling of halyard

An ancient unit of currency of England, equivalent to half a noble

plural of half-noble

(US, military, nautical) A flag officer in the United States Navy, United States Coast Guard, National Oceanic and Atmospheric Administration Commissioned Corps, or Public Health Service Commissioned Corps of a grade superior to a rear admiral (lower half) and junior to a vice admiral. A rear admiral (upper half) is equal in grade or rank to an Army, Marine Corps, or Air Force major general. A rear admiral (upper half) wears a two star insignia on most uniforms and a gold stripe above a broad gold stripe on the sleeve of certain dress uniforms.

(US, military, nautical) A commissioned officer in the United States Navy, Coast Guard, NOAA Corps, or PHS Corps of a grade superior to a captain and junior to a rear admiral (upper half). A rear admiral (lower half) is equal in grade or rank to an Army, Marine Corps, or Air Force brigadier general.

(rugby) the scrum-half and the fly-half

(rugby) a player who temporarily takes the scrum-half's place while the latter is unavailable due to being involved in the breakdown, having an injury, or having been sin-binned.