Dave Petratis -- Chairman, President, and Chief Executive Officer
Thanks, Mike. Good morning, and thank you for joining us today. Allegion saw another quarter of strong top-line revenue growth with strength across all regions. The Americas saw strong volumes in the nonresidential business as end market fundamentals continue to be positive, particularly in institutional verticals.
EMEIA and Asia Pacific saw organic growth rates in the mid-single digits. Acquisitions continue to be -- to contribute to the total company revenue growth. Electronics growth moderated in the fourth quarter, with the Americas seeing approximately 7% growth. Residential electronics performed well.
However, the nonresidential electronics growth decelerated due to the timing of large orders. We had full-year electronics growth of high-teens in the Americas, with strength in both parts of the business. We see the electronics outlook continue to be a long-term positive trend as more and more products become connected for ease of access. As I stated earlier, nonresidential U.S.
end markets remain healthy with particular strength in institutional verticals. We do see residential new construction softening, but we expect this to be mitigated by electronics and channel [REMOVIDO]s to drive above-market growth. The quarter saw continued inflationary pressures, which we believe will ease in 2019. Commodities have leveled off, and we project to have another solid year in price realization with particular strength in our Americas nonresidential businesses.
In the fourth quarter, we delivered nearly 10% adjusted EPS growth, bringing the full-year expansion to approximately 14%, as we drove a robust 37% increase in available cash flow, which totaled more than $400 million for the year. Overall, I am extremely pleased with the revenue performance in both the quarter and the full year. Additionally, while operating margin could have been better, I'm satisfied with the growth in EPS that we delivered in the quarter and the full year. Please go to Slide 5, and I'll walk through the fourth-quarter financial summary.
In Q4, Allegion delivered strong top-line revenue growth. Revenue for the fourth quarter was $702.4 million, an increase of 12.4%, inclusive of organic growth of 6.7%. Acquisitions also contributed to the top-line revenue expansion, offsetting the slightly unfavorable currency impact. All regions grew organically.
Americas led the way with organic growth of 7.6% in the quarter, driven by strength in our nonresidential business. The EMEIA region saw organic growth of 4.3%, driven by performance in the SimonsVoss and Interflex businesses. Asia Pacific had a nice quarter of organic growth coming in at 4.6% against a tough comparable. Adjusted operating margin decreased by 130 basis points due to the dilution related to acquisitions made in 2018.
Excluding the impact of these acquisitions, the base operating margins were up 20 basis points. Inflationary headwinds continued to pressure margins and exceeded price and productivity in the quarter. The company is committed to driving price realization and productivity actions, such that for 2019 the price productivity inflation dynamic is expected to be positive, helping to drive margin expansion across all regions of the business. Adjusted earnings per share of $1.22 increased $0.11 or nearly 10% versus the prior year.
The increase was driven by higher operating income along with a favorable year-over-year tax rate. Available cash flow for the year came in over $408 million, an increase of more than 37% versus prior year. Increased earnings and the nonrecurring 2017 discretionary pension funding drove the increase. Please go to Slide 6.
Before I turn the call over to Patrick, I want to talk a little about some of the things we are doing in the Connected Home space. In 2015, Schlage with the first smart lock to respond to "hey Siri, open my lock." Now Schlage Encode is the first lock to work with the Key by Amazon app and Ring devices without needing a Wi-Fi hub. It's built right into the lock. With Schlage Encode, we took a different approach to development, starting first with the Connected Home platform and developing the lock around the desired user experience.
The user-first approach is part of our strategic plan to develop and integrate with leaders in Connected Home platforms. In addition, we recently announced the Schlage Connect Z-Wave Plus enhancement and its compatibility with Ring, and Schlage Connect Zigbee-certified locks with support home automation systems. Our deep experience in connected home security has made us a go-to partner for a wide variety of platforms and home automation solutions, including Amazon, Ring, Alarm.com, Google and Apple. We will continue to build relationships to benefit consumers and accelerate adoption of Schlage smart products.
Allegion (ALLE) Q4 2018 Earnings Conference Call Transcript -- The Motley Fool
