Webster's Revised Unabridged Dictionary · 1913

Reluctance

Reluctance (r?-l?k"tans) , noun

[See Reluctant.]

1.
The state or quality of being reluctant; repugnance; aversion of mind; unwillingness; -- often followed by an infinitive, or by to and a noun, formerly sometimes by against.
Tempering the severity of his looks with a reluctance to the action. — Dryden
He had some reluctance to obey the summons. — Sir W. Scott
Bear witness, Heaven, with what reluctancy Her helpless innocence I doom to die. — Dryden
2.
(Electricity) Magnetic resistance, being equal to the ratio of magnetomotive force to magnetic flux.

Also: Reluctancy