Lancefaire (槍の達人, Yari no Tatsujin, lit. Master of the Spear in the Japanese version, Art de la lance in the French version, Affinità lance in the Italian version, Maestría: lanza in the Spanish version) is a Skill introduced in Fire Emblem Awakening.
In Awakening, due to being possessed by Falcon Knights, Lancefaire is a female-only skill, barring inheritance. This is similar to Axefaire which is wielded by the male-only class Berserker.
Lancefaire is the only physical weapon skill given to a class that can wield two weapons. It is likely Falcon Knights received this skill due to Awakening lacking a class that wields lances exclusively.
This makes the Falcon Knight class analogous to the Sage class in the manner that they both wield a single weapon type and staves.