Glossary of military terms - I

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Iaculator	'Spear thrower'. light legionary foot soldier.
Iaculum	Missile. javelin.
Ignominiosa missio	Dishonourable discharge.
Ilarchès	'Wing commander'. cavalry officer.
Ilè	"Wing'. military unit.
Imaginifer	Standardbearer carrying a likeness of the emperor.
Imago	Standard with the emperor's portrait.
Immounos	Soldier exempted from certain duties.
Immunis	Soldier exempted from certain duties.
Immunis perpetuus	Soldier permanently freed from fatigue duties. the unusual addition of perpetuus seems to suggest that other immunes may have enjoyed this status for only a limited period of time.
Impedimenta	Baggage.
Impeditus	Soldier carrying baggage pack.
Imperator	Commander-in-chief. emperor.
Imperium	A - the right to command absolute obedience. B - empire.
Impetus	Attack.
In calceo agens	Serving in equestrian position ie as centurio , praefectus or tribunus .
In caliga agens	Serving as soldier, NCO or non-equestrian centurio .
In numeros referre	To enroll. to enter an accepted soldier in the records.
In praetorio agens	'Serving at the HQ'. serving in cohortes praetoriae .
In vestimentum	Clothing expenses.
In victum	Food expenses.
Incomma	Standard height.
Indictio	Levy of tax in kind.
Inimicus	Hostile, enemy.
Insidia	Ambush.
Insidiator	'Ambusher'. soldier belonging to screening force. flank guard.
Insigne	Distinguishing mark.
Interpres	Interpreter.
Intervallum	Space between the wall and the living quarters of a camp.
Ioviani	'Iuppiter's own'. tetrarchic elite legion.
Iter	March.
Iter iustum	Normal day's march of 20 Roman miles.
Itinerarium	Simplified road map.
Iudex	'Judge'. Latin name given to Gothic supreme war leader known as the thiudans.
Iugum	Yoke. gate made of spears under which captive soldiers were made to pass as a humiliation.
Iumentarius	Soldier or military servant in charge of baggage animals.
Iumentum	Pack animal.
Iuniores	'Recruits'. late Roman unit created around nucleus of veterans detached from another formation.
Ius conubii	Right to contract a marriage.
Ius fetiale	'Fetial law'. religious rules governing Roman external relations and formal declaration of war.
Iuventus	Paramilitary youth organisation.

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