e·pact 
(ēpăkt′)
(ēpăkt′)n.
The period of time necessary to bring the solar calendar into harmony with the lunar calendar.
[French épacte, from Late Latin epacta, from Greek epaktē (hēmera), intercalary (day), feminine of epaktos, brought in, inserted, from epagein, to bring in, introduce : ep-, epi-, epi- + agein, to lead; see ag- in the Appendix of Indo-European roots.]
- infrastructural
- infrastructure
- infrequence
- infrequency
- infrequent
- infrequently
- infringe
- infringement
- infringer
- infructescence
- in full cry
- in full swing
- in fun
- infundibular
- infundibulate
- infundibuliform
- infundibulum
- infuriate
- infuriatingly
- infuriation
- infuse
- infuser
- infusibility
- infusible
- infusibleness